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问题

________ they become dirty, the lakes are not able to clean themselves

A:Once
B:Since
C:As
D:Because
正确答案是:
同类题型

Helen ________ her keys in the office so she had to wait until her husband ______ home

It was pretty _______ from her voice that she was playing a trick on all of us.

The robbers searched all the boxes in the house, hoping to __________more valuables

All of us know Wednesday is the ________ day of a week.

Hello! May I speak to Mike, please -This is Mike speaking. _______.

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