I often visited Tian’an Men Square _______I was staying in Beijing.
A. until
B. during
C. while
D. throughout
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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
I will never stop _______they may not like it.
A. no matter how
B. how
C. what
D. though
Father was _______busy in working ________he often forgot rest or meals.
A. very, that
B. so, that
C. such, as
D. enough, as