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

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单项选择题
Who made the telephone call（）

A. Mr. Smith.
B. Miss White.
C. Miss Smith.
D. Mr. Brown.
单项选择题
What’s the probable relationship between the two speakers？（）

A. Husband and wife.
B. Waitress and guest.
C. Boss and secretary.
D. Doctor and patient.
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