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问题

I can still remember that it is since the 1990’s, _____ we began to use cell phones,_______ the number of mobile users has greatly increased

A:while; when
B:when; what
C:before; that
D:when; that
正确答案是:
同类题型

Bad luck! On my way home, I had my watch _______.— I’m sorry to hear that. Maybe you will have no choice but _______ another one.

How did you sleep last night?—A sound sleep. Never slept ______.

Never before ____ in greater need of modern public transport than it is today.

I don’t think Germany will win the World Cup three years from now.

All the staff in our company are considering to the city center for the fashion show.

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