单项选择题


A．understands
B．understanding
C．understood
D．to understand
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单项选择题
A．differenceB．difficultyC．dislikeD．discipline
A．difference
B．difficulty
C．dislike
D．discipline
单项选择题
A．thisB．itC．thatD．you
A．this
B．it
C．that
D．you
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