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问题

____________ the dinosaurs disappeared still remains a mystery

A:whether
B:that
C:if
D:Why
正确答案是:
同类题型

The car is ______ expensive. I don’t have ______ money to buy.

Which sport costs the most _____ training facilities, players’ personal equipment and uniforms?

––Terribly sorry but I thought this was a parkinglot.––_______. Here is your ticket.

I can hardly believe my eyes. Is that you, Lucy—Yes. It has been almost 20 years ______ we were together.

_________ to the efforts by the headmaster, I can go back to school now.

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