The first group was given five doses______weekly intervals.A、atB、inC、onD、for

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问题 The first group was given five doses______weekly intervals.

选项 A、at
B、in
C、on
D、for

答案 A

解析固定搭配题。at weekly intervals为习惯搭配，意为“每隔一星期”，故[A]为答案。

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