.A man may usually be known by the books he reads by the friends he keeps.
A. as well as
B. as if
C. as soon as
D. as usual
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(答案→)A. as well as
B. as if
C. as soon as
D. as usual
解析：考查连词的意义与用法。as well as连接两个并列成分,as if意为“似乎,好像”；as usual意为“通常”；as soon as意为“一……就”。