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问题

Several students were working _____the difficult math problem after class. [ ]

A: in
B: to
C: off
D:on
正确答案是:
标签: several , students , were
同类题型

It was ____ exciting news that more than ten students in a single school were admitted to Tsinghua University in the same year.

Lucy,do you prepare for your trip?—No, I don’t. I will ____ the best way to have our trip.

My jacket has color yours, but mine is bigger than yours.[ ]

That wasn’t a bad idea _.[ ]

Have you ever _______ to Singapore?–No, never.

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