单项选择题

A．only
B．usually
C．sometimes
D．seldom
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单项选择题
A．whatB．thatC．whichD．when
A．what
B．that
C．which
D．when
单项选择题
A．watchedB．followedC．understoodD．grasped
A．watched
B．followed
C．understood
D．grasped
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