题目内容

Scientists observe ___ making the most of our senses when we are young can keep us healthy later on in life.
A．ifB．whatC．thatD．When
C
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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