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【单选题】

It ______last week that the haze(雾霾) in Beijing caused many problems.

A.
reports
B.
reported
C.
is reported
D.
was reported
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参考答案:
参考解析:
.
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举一反三

【单选题】Mary often _______ to school.[ ]

A.
take a bike
B.
takes a bus
C.
by a train
D.
walk