Our teacher told us that pollution _____a very serious problem in the world we live. [ ]A. has be B. had been C. is D. was -初中英语-n多题

◎ 题干

Our teacher told us that pollution _____ a very serious problem in the world we live.

A. has be
B. had been
C. is
D. was

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◎ 解析

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◎ 知识点

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