—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

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根據(jù)短文內(nèi)容，從短文后的選項(xiàng)中選出能填入空白處的最佳選項(xiàng)。選項(xiàng)中有兩項(xiàng)為多余選項(xiàng)。

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F. That makes it possible for them to visit more patients each day.

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完形填空

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