单项选择题

The conference（）in Beijing next week is bound to be a great success.

A. holding
B. being held
C. to hold
D. to be held

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单项选择题
For years, doctors（）millions of patients’ lives with the help of microscopes.

A. have saved
B. are saving
C. will save
D. were saving
单项选择题
Who made the telephone call（）

A. Mr. Smith.
B. Miss White.
C. Miss Smith.
D. Mr. Brown.
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