Example sentences of "must have become [adj] " in BNC.

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1 Neither of them seems to have read any work of Latin poetry , though at least Polybius must have become fluent in the language : even their direct use of Latin historians is doubtful .
2 Sweet heaven , now her brain must have become addled , if that was the best she could come up with .
3 Here , the electrical properties of cells must have become important .
4 Soon it must have become obvious to the story-tellers that such a huge land could no longer be fitted into the Mediterranean , and so it was resited beyond the Gates of Hercules .
5 He nodded and there followed an awkward silence where Julie and Nina must have become aware of the tension , for they glanced at each other at the same moment as a patient arrived in the centre .
6 ( c ) It must have become impracticable for the consumer to identify the actual producer ( s. 2(3) ( b ) ) .
7 It must have become clear to us by now that a committee of different subject specialists trading off time and contents with each other is an unwieldy and potentially dangerous body .
8 In the hope that deteriorating wartime conditions in Vietnam would spark insurrection , a liberation army of sorts was being formed on the border ; but when the attack went off at half-cock ( leaders executed or arrested and followers dispersed ) another threat to the French position was removed and it must have become clear that the only credible threat to French power lay in France itself , at least until the forces of nationalism were able to attract some effective outside sponsorship or else embed themselves in the people to the point where they became an organized national resistance .
9 But as they flourished , so this food must have become scarcer .
10 What they are seeking to share with others must have become true for them .
11 I put down the receiver and sat on the stairs trembling with panic , and I think I must have become pale , because I remember that my face felt very cold .
12 She must have become conscious of my appraisal , because she suddenly turned and glanced at me directly .
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