单项选择题

The sun had hardly risen ______ the fog began to disappear.
A) as C) while
B) till D) when

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单项选择题
I have lost sight of my morn, but I just saw her ______in front of me.
A. were walking
B. to have walked
C. walk
D. walking
单项选择题
The fact ______ exercise is good for health is known to all.
A. which
B. what
C. that
D. it
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