A man may usually be known by the books he reads by the friends he keeps.A. as usualB. a

问题补充：

A man may usually be known by the books he reads by the friends he keeps.

A. as usual

B. as soon as

C. as if

D. as well as

答案：

A. as usual

B. as soon as

C. as if

(答案→)D. as well as

解析： as well as连接两个并列成分，意为“也”。