题目内容

It was _______it rained heavily that they didn’t come.

A. as
B. because
C. for
D. since

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_______I saw the computer, I showed great interest in it.

At first
B. For the first time
C. Until
D. The first time

I often visited Tian’an Men Square _______I was staying in Beijing.

A. until
B. during
C. while
D. throughout

I knew Mr. Green _______I knew Mrs. Green.

A. long before
B. before long
C. long ago
D. after long

They waited _______it was dark before leaving, ______they didn’t want anyone to see them leave.

A. since; because
B. until; as
C. unless; for
D. so; because

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