2. 自考
  3. There is often______between becoming infected and the first signs of the illness.

There is often______between becoming infected and the first signs of the illness.

admin2017-06-30  68
问题 There is often______between becoming infected and the first signs of the illness.
选项 A、a stop
B、an interruption
C、a lag
D、a lack
答案C
解析
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