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---who______it be that is knocking at the door?
---It_______be Father, but I’m not sure.
A．can, mustB．can, mayC．must, canD．may, must
B

試題分析：句意：--敲門的會是誰？---有可能是父親，但是我不是很肯定。第一空填can，用于否定或疑問句表示推測“可能”，第二空填may，因為說話人不是很確定，but I’m not sure.所以選B。
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