37．---Who it be that is knocking at the door? ---It be Mother, but I’m not sure. A．——青夏教育精英家教网—

摘要：37．---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

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.---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

—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

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