单项选择题

It was about 600 years ______ that the first clock was made.

A.ago
B.before
C.since
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单项选择题
Our teacher’s lunch time is different from ______.
A.us
B.our
C.ours
单项选择题
Sara looks just like her sister ______ she’s much younger.
A.but
B.so
C.or
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