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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
考查從句關(guān)系詞的選擇。根據(jù)句子結(jié)構(gòu)可知observe后面的是賓語從句，從句中不缺少成分，所以選擇that，if意為是否  what作主語或者賓語 when作時間狀語
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