问题

carry on the work ______ we can get the machineswe need. After all, it’s the determination that really counts.

A:unless
B:before
C:whether
D:while

正确答案是：

同类题型

We should return the books to the library______ time.

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What do you think of the film So Young —________, but someone thinks it’s_________

ike some more cheese.—Sorry, there’s _____ left.

_____ to playing computer games, he is always absent from school.