题目内容

-- When did you leave your office yesterday?-- finished the project.

A. Until
B. While
C. When
D. Not until

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-- Would you like to go bike riding with us tomorrow?-- Sure, I am busy.

A. since
B. unless
C. when
D. until

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A. Unless
B. Though
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A. until
B. if
C. because
D. so

It is necessary for children to exchange ideas with parents from time to time a good parent-children relationship could be set up.

A. so that
B. because
C. as soon as