单项选择题

It was quite a long time______I recognized him.

A．after
B．before
C．when
D．since
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单项选择题
______blacks are looked down upon.
A．Gone are the days when
B．Gone are the days which
C．Went are the days when
D．Went are the days that
单项选择题
______about the exam that he decided to turn to Mr. Zhang for help.
A．So curious he was
B．So curious was he
C．Such curious he was
D．Such curious was he
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