Make sure_____he is at home or not before you call on him. [ ]A. if B. whether C. what D. how-初中英语-n多题

◎ 题干

Make sure _____ he is at home or not before you call on him.

[ ]

A. if
B. whether
C. what
D. how

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◎ 解析

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◎ 知识点

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