阿摩線上測驗
18. Bob was a pioneer in the industry, and much of what he did _____ now the standard today.
(A) is
(B) are
(C) am
(D) will be
答案：登入後查看
統計： A(177), B(33), C(2), D(31), E(0) #2913521
統計： A(177), B(33), C(2), D(31), E(0) #2913521
