He ________ the window of our classroom yesterday because he didn’t come to school．           
A．mustn’t have brokenB．mightn’t have broken
C．shouldn’t have brokenD．couldn’t have broken
D
考查推測。用情態(tài)動詞can/ may/ must. 否定句用can/could .對過去推測用     情態(tài)動詞 +have done.
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