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
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統計： A(184), B(34), C(2), D(32), E(0) #2913521
統計： A(184), B(34), C(2), D(32), E(0) #2913521
