单项选择题

There were 150 ______ at the international conference this summer.

A. spectators
B. viewers
C. participants
D. onlookers
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单项选择题
Which of the following sentences is INCORRECT
A. All his lectures are very interesting.
B. Half their savings were gone.
C. Many his friends came to the party.
D. Both his sisters are nurses.
单项选择题
Due to personality ______, the two colleagues never got on well in work.
A. contradiction
B. conflict
C. confrontation
D. competition
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