【解析】考查主语从句引导词whether的用法。根据句意:……能否达到这种极限将视他的环境而定。whether引导主语从句。
69.(2017•重庆高考) Evidence has been found through years of study______ children’s early sleeping problems are likely to continue when they grow up.
A. why
B. how
C. whether
D. that
【答案】D
【解析】本题考查名词性从句。that从句为“Evidence”的同位语从句,解释说明evidence的内容。
70.(2017•全国高考) It is by no means clear______the president can do to end the strike.
A. how
B. which
C. that
D. what
【答案】D
【解析】考查主语从句的连接词。此处It是形式主语,what引导的是主语从句,作真正的主语,what在从句中作do的宾语。句意:总统采取什么行动结束这次罢工一点儿也不清楚。
71.(2017•北京高考)Jerry did not regret giving the comment but felt ______ he could have expressed it differently.
A. why
B. how
C. that
D. whether
【答案】C
【解析】本题考查宾语从句的用法。felt后的宾语从句中不缺成分,所以用that来引导宾语从句。句意:Jerry不后悔给出那样的评论,但觉得应该换种方式表达。
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