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-Who it be that is knocking at the door? -It be Father, but I'm not sure. [ ] A.

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-Who it be that is knocking at the door? -It be Father, but I'm not sure. [ ] A.

-Who ________ it be that is knocking at the door?

-It ________ be Father, but I'm not sure.

[]A.

can; must

B.

can; may

C.

must; can

D.

may; must

试题答案

答案:D