问题补充:
---whoit be that is knocking at the door?
---Itbe Father, but I’m not sure.
A. can, must
B. can, may
C. must, can
D. may, must
答案:
A. can, must
(答案→)B. can, may
C. must, can
D. may, must
解析:句意:--敲门的会是谁?---有可能是父亲,但是我不是很肯定。第一空填can,用于否定或疑问句表示推测“可能”,第二空填may,因为说话人不是很确定,but I’m not sure.所以选B。
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