单项选择题

The discussion ______ a wide range of subjects.

A. dealt
B. did
C. covered
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单项选择题
Please speak louder __________ we can hear more clearly.
A. so that
B. since
C. when
单项选择题
Which language is ______ , English, Chinese or French
A. difficult
B. the most difficult
C. more difficult
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