问题

It is necessary to explain your theory _____, otherwise the audience won’t make sense of what you are trying to get across
A:on purpose
B:at length
C:at random
D: on average
B:at length
C:at random
D: on average
正确答案是:
同类题型
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ack! When did you arrive in Berlin—Last weekend .I adifferent culture since then.
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