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【单选题】

He had to put his shoes lightly,he?

A.
didn't
B.
did
C.
had
D.
hadn't
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参考答案:
参考解析:
.
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举一反三

【单选题】He doesn’t know how ____________.[ ]

A.
to keep health
B.
to stay healthy
C.
keeping fit
D.
keeps healthy