单项选择题

______ from the sun ______ we get light and heat.

A. It was ... that B. It is ... that
C. It was ... which D. It is ... which
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单项选择题
A middle-aged woman with a baby in her arms ______ seen at the gate.
A. was
B. were
C. has
D. have
单项选择题
-- You must have met him the other day. -- Oh, no, I______
A. hadn’t
B. mustn’t
C. haven’t
D. didn’t
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