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【题目】—How old is Susan?
—She be 14 years old, but I' m not sure.
A.should
B.can
C.may
D.must

【答案】C
【解析】句意:---苏珊多大了?---他也许14岁,但是我不太确定。should应该;can表猜测的时候通常用于否定句和疑问句中;may表示可能的猜测,意思是“也许”;must表示肯定的猜测,意思是“一定;肯定”。根据not sure可知表示可能,所以答案是C。

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