问题补充:
Scientists observe making the most of our senses when we are young can keep us healthy later on in life.
A. if
B. what
C. that
D. When
答案:
A. if
B. what
(答案→)C. that
D. When
解析:考查从句关系词的选择。根据句子结构可知observe后面的是宾语从句,从句中不缺少成分,所以选择that,if意为是否 what作主语或者宾语 when作时间状语
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