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_______

A. 向垂直方向
B. 向水平方向
C. 按住Ctrl键向垂直方向
D. 按住Ctrl键向水平方向

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Two hundred cars ________ since the beginning of the year.

A. sell
B. are sold
C. have sold
D. have been sold

By the end of next semester, we ______ more than three thousand new words.

A. have learned
B. will learn
C. will have learned
D. have been learning

______

A. 128
B. 160
C. 180
D. 220

Lucy ______ her homework this morning, but she didn't.

A. may be doing
B. must have done
C. should have done
D. can do