11.Children's brains can't develop properly they lack protein. A.when B.since C.because D.unless 答案与解析:A 考查when的一个特殊用法.本题中的when引导的是一个条件状语从句.相当于if.句意:如果孩子缺少蛋白质.大脑就不能正常发育. 查看更多

 

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Children’s brains can’t develop properly_______ they lack protein(蛋白质).

A.when

B.since

C.because

D.unless

 

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Children's brains can't develop properly ________ they lack protein.

[  ]
A.

when

B.

since

C.

because

D.

unless

查看答案和解析>>


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