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【单选题】

.Have you got any books ____ problems with children?

A.
treat
B.
to treat
C.
that treat
D.
what treat
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参考解析:
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举一反三

【单选题】_____ I entered, he was _____ in his book and didn’t notice me.

A.
When; devoted
B.
While; absorbed
C.
When, absorbed
D.
While, devoted