2. 外语
  3. The first group was given five doses______weekly intervals.

The first group was given five doses______weekly intervals.

admin2015-04-29  14
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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