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