【題目】Let's ask the teacher for help. She ________ the answer.
A.must know
B.mustn’t know
C.could knowing
D.can’t know

【答案】A
【解析】句意:我們?nèi)ハ蚶蠋熐笾桑欢ㄖ来鸢。must表示肯定的猜測,“一定,肯定”,mustn't表示禁止,“千萬不要,一定不要”,故排除B;could表猜測的時候意思是“也許”,后跟動詞原形,所以排除C;can't不能,表猜測時意思是“不可能”,根據(jù)句意排除D。所以正確答案是A。

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