单项选择题

The scientists began to accumulate a huge mass of dat

a.A. build upB. put upC. make upD. clear up
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单项选择题
To tell you the truth, I did extract several passages from the speech when writing my speech.
A. take out
B. take off
C. take on
D. take up
单项选择题
The expert used a picture to give out the illustration.
A. lesson
B. explanation
C. practice
D. show
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