题目内容
.
.---Who ________ it be that is knocking at the door?
---It________ be Mother, but I’m not sure.
A. can; must B. can; may C. must; can D. may; must
B
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题目内容
.
.---Who ________ it be that is knocking at the door?
---It________ be Mother, but I’m not sure.
A. can; must B. can; may C. must; can D. may; must
B