单项选择题

I was about to leave my house ______ he came.

A．while
B．as
C．when
D．since
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单项选择题
______ which is lighted up by the sun is bright, at the other times.
______ which is lighted up by the sun is bright, at the other times.
单项选择题
The moon is like a huge mirror hung in the sky ______ .
The moon is like a huge mirror hung in the sky ______ .
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