High school students should be given enough sleeping time , _______ they are busy with their study .
A．even soB．a(chǎn)s thoughC．a(chǎn)s ifD．even if
D
 本題考查連詞辨析。句意：應該給中學生充分的睡眠, 盡管他們忙于準備各種各樣的考試。由句意可知D項正確。
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