题目内容

Tom's sister is the girl ______ an English song in the next room .

A. who is singing
B. is singing
C. was singing
D. singing

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This is _____ useful book. I've read it for _____ hour.

A. an, /
B. an, an
C. a, an
D. an, the

The teacher told his classlight travels faster than sound.

The man ______ (who/what) you saw yesterday is a doctor from Beijing.

Here is a book ______(who/that) will give you a lot of usful information.

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