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问题: 状语从句 .

______a baby turtle is hatched,it must be able to feed for itself.
A.no sooner
B.not sooner than
C.at the time
D.as soon as

解答:

______a baby turtle is hatched,it must be able to feed for itself.
A.no sooner
B.not sooner than
C.at the time
D.as soon as

沿用本人惯用的排除法^_^
A. no sooner 。。。。than。。。结构不完整,排除
B。搭配错误
C。若可以,则会缺少一个when,at the time when a baby。。。
因此,无可奈何,只能选D