He looks so weak and pale suffering from a serious illness.
A. as if
B. as long as
C. now that
D. even if
网友回答
(答案→)A. as if
B. as long as
C. now that
D. even if
解析：词义辨析。as if仿佛，好像；as long as只要；now that由于，既然；even if
即使，甚至；句意：他看起来如此的虚弱，苍白仿佛才从一场大病中恢复过来。选A。