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Biologists believe that they have found one of the substances that tell individu
Biologists believe that they have found one of the substances that tell individu
游客
2025-02-25
30
管理
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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