If you make_ _ most of forty-five minutes classes day after day, there will be ______switch in grades.

A．/; / B．the; / C．/; a D．the ; a

D

【解析】

試題分析：句意：如果你每天充分利用課堂45分鐘，你的成績(jī)就會(huì)改變。充分利用，make the most of，故第一個(gè)空用定冠詞the，switch，變化，轉(zhuǎn)變，為可數(shù)名詞，故第二個(gè)空用不定冠詞a。故選D。

考點(diǎn)：考查冠詞用法

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