问题
选择题
He ________ the window of our classroom yesterday because he didn’t come to school．
A．mustn’t have broken
B．mightn’t have broken
C．shouldn’t have broken
D．couldn’t have broken
答案
答案：D
考查推测。用情态动词can/ may/ must. 否定句用can/could .对过去推测用 情态动词 +have done.