Henry must have stayed up last night, ________ he looks so tired and sleepy.
A．forB．a(chǎn)sC．thoughD．since
A
考察連詞。A.因?yàn)?nbsp; B.因?yàn)椋浑S著 C. 盡管   D. 因?yàn)椋患热�。for表示所說的理由是一種補(bǔ)充說明, since和as是從屬連詞，說明的是已為人們所知和理由。句意：亨利昨晚肯定熬夜了。因?yàn)樗雌饋砣绱死酆屠ХΑ＝Y(jié)合語境可知選A。
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