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【单选题】
Sorry, Peter. I took your backpack . [ ]A.
by accident
B.
by the way
C.
by air
D.
by mistake
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A.
if
B.
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C.
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since
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A.
which
B.
that
C.
when
D.
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A.
建设单位负责举证
B.
施工单位负责举证
C.
监理单位负责举证
D.
建设单位与监理单位负责举证
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