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【单选题】

The teacher is writing ____ a piece of chalk on the blackboard while the students are writing ____ink in exercise books.

A.
with, in
B.
in, with
C.
in, in
D.
with, with
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参考解析:
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举一反三

【单选题】I had no idea when and where _____. [ ]

A.
it happened
B.
does it happen
C.
it had happened
D.
had it happened