单项选择题

-- Hello, is that Mrs. Black speaking
-- Yes, who's that
-- () Mary.

A. I'm
B. That's
C. She's
D. This is

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单项选择题
Our teacher never () us leave class early.

A. lets
B. allows
C. make
D. tells
单项选择题
The medicine had no () on him.

A. affection
B. effect
C. affect
D. effective
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