单项选择题

If you ______ change your mind, please let us know.

A. should
B. shall
C. will
D. would
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单项选择题
It cost the patient ￡1000 a week to keep in ______ care.
A. intense
B. tense
C. intensive
D. intent
单项选择题
When he was waken by some strange noise, he found himself, to his astonishment, surrounded by a ______ of wolves.
A. herd
B. school
C. flock
D. pack
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