问题

The experiment is of particular importance.　　　　—I see. We will carry on with it ________ we can get enough money.

A:unless
B:though
C:whether
D:until

正确答案是：

同类题型

______ all the stories, I think the first story is ______ one.

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We are never ______ old ______ dream a new dream.

How many people are there in the city –_______.