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问题

still remember that it is since the1990’s, _____ we began to use cell phones,_______ the number of mobile usershas greatly increased

A:work
B:are working
C:havebeen working
D:worked
正确答案是:
同类题型

I have to go to work by taxi because my car _____ atthe garage.

This new model of car is so expensive that it is________ the reach of those with average incomes.

We can no longer ____to consider water an almost freeresource that we can use as much as we like.

When I was a child, I ______ watch TV whenever I wanted to.

The great millionaire gave away all his fortune to the charity and lived a simple life,________.

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