2. 外语
  3. Biologists believe that they have found one of the substances that tell individual genes both when to become active and when to

Biologists believe that they have found one of the substances that tell individual genes both when to become active and when to

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问题 Biologists believe that they have found one of the substances that tell individual genes both when to become active and when to remain quiescent in the earliest phases of an embryo’s development.
选项 A、tell individual genes both when to become active and when to remain
B、tell individual genes both at which time they should become active or should remain
C、tells individual genes both when to become active or remain
D、tells individual genes both when to become active or when to remain
E、will tell an individual gene both about when it should become active and remain
答案A
解析 B、C、D中，both…or的搭配是绝对错误的。E中：both…and结构，两者之后所跟的词组形式不一致。A中用一个when+动词不定式的省略结构，不仅表达了句意，且表达简洁。
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