问题
选择题
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
答案
答案：A
这是一个强调句，强调时间状语about 600 years ago。
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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
答案：A
这是一个强调句，强调时间状语about 600 years ago。