单项选择题

The first software of Windows（）by Bill Gates became popular with computer lovers immediately.

A. made
B. had made
C. was made
D. had been made

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单项选择题

A. twice as more
B. as twice more
C. as twice much
D. twice as much

单项选择题

A. have completed
B. will be completed
C. had been completed
D. will complete

单项选择题

A. The receptionist
B. The hotel manager
C. The service maid
D. The operator