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问题

We must __________ that the experiment iscontrolled as rigidly as possible.

A:propose
B:secure
C:ensure
D:Issue
正确答案是:
同类题型

When the headmaster spoke out his plan, the _____of the students in the class ____ against it.

o friends are ________ related likethe lips and teeth, and you can often see them stay ________ together, hand inhand

By this time next year we fromthe college.

I’m feeling much better now, so you call the doctor.

_____ for the free ticket, I would not have gone to the films so often.[ ]

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