題目列表(包括答案和解析)
The air in big cities _____very dirty by factories.
A. are often made B. is often made C. have often madeD. has often made
The air in big cities _____very dirty by factories.
A.a(chǎn)re often made |
B.is often made |
C.have often made |
D.has often made |
The air in big cities _____very dirty by factories.
A. are often made B. is often made
C. have often made D. has often made
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