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【单选题】

Last Sunday they reached Qingdao,____a conferencewas to be held.
[ ]

A.
which
B.
that
C.
when
D.
where
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参考解析:
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举一反三

【单选题】I wondered what great difficulty he had ________ the plan.

A.
to carry out
B.
carrying out
C.
carried out
D.
with carrying out