问题描述：
这个英语题为什么选A不选D
It was about 600 years ago ( )the first clock with a face and an hour hand was made.
A that
B until
C before
D when
It was about 600 years ago ( )the first clock with a face and an hour hand was made.
A that
B until
C before
D when
问题解答：
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