题目内容

We're talking about the pianist ________ will visit our school next week.

A. which
B. who
C. whom

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

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

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

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

Here is your bill. Please______(check) it carefully.

The luggage ___ (leave) at the air port by a careless traveller.

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