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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

. ____ to speak when the audience interrupted him.

She can hardly write her own name, ______?

All the members thought that the plan should be changed, but he still ________ his own idea.

This weekend I asked students _____ fashion.[ ]

Yesterday I didn’t _____ any seals but _____ some dolphins.

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