单项选择：
1. Since the first space mission, many communication satellites ________.
A. was launched B. are launched C. have been launched D. had been launched
2. What kind of advice ________ you?
A. has gave B. was gave C. had been given to D. has given
3. The slave ________ from morning till night.
A. madeto work B. was made working C. was made worked D. was made to work
4. The construction of the laboratory ________ by the end of July.
A. must be completing B. must complete
C. must have completed D. must have been completed
5. Your proposal ________ by the committee soon.
A. is discussed B. has been discussed
C. is going to be discussed D. will have been discussed
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