单项选择题

If she refuses to answer your phone calls, just ______ calling until she does answer.

A) insist in
B) persist in
C) to insist on
D) to persist on
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单项选择题
Please ______ me of it again tomorrow in case I forget.
A) mind
B) remind
C) tell
D) ask
单项选择题
He can't be a teacher ______ he is only 16 years old.
A) except that
B) but that
C) now that
D) in that
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