单项选择题

By the time the soldiers arrived，the building（）．

A.has destroyed
B.has been destroyed
C.had been destroyed
D.had destroyed

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York，（） last year，is a nice old city．

A.that I visited
B.which I visited
C.where I visited
D.in which I visited
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The mother often tells her son to be a good boy，warning him to（）trouble.

A.hold back from
B.keep out of
C.break away from
D.get rid of
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