题文
--Who______ it be that is knocking at the door?
--It ______ be Father, but I’m not sure.
| A.can; may | B.can; must |
| C.must; can | D.may; must |
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--Who______ it be that is knocking at the door?
--It ______ be Father, but I’m not sure.
| A.can; may | B.can; must |
| C.must; can | D.may; must |
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