It was in the lab ___ was taken charge of by Professor Harris ___ they did the experiment.
A. which; that
B. that; what
C. whom; that
D. which; where
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Many people now make______ a rule to buy cards for their friends before Christmas.
A. themselves
B. it
C. that
D. this
Someone is at the door, who is _______?
A. this
B. that
C. it
D. he
-It is raining cats and dogs.- .
A. So it is
B. So is it
C. Neither it is
D. Neither is it
青年人选择热烈奔放，舒展健美，有活力的动作，力求动作是：
A. 力度强、幅度大、速度快、变化大、时间长
B. 力度强但时间短，变化小
C. 力度小、时间长、速度快
D. 力度小、幅度大、变化小、速度快
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