Students should do everything they can __their study.
A．improveB．to improve
C．improvingD．improved
B
考查非謂語動詞.句意:學生們應該做任何他們能做的事情來提高他們的學習. they can為后置定語,動詞不定式做目的狀語,表示具體的將要進行的動作,結合語境可知選B.
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