178.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.
(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（A）D-22
(E) will tell an individual gene both about when it should become active and remain
答案a没有问题，我想问的是一个语法点：one of ＋复数n.＋v.复数，the only one of ＋复数n.＋v.单数，是这样么？？跟单数还有什么类似的情况？？
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发表于 2006-2-25 20:54:00
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