14 In many ways one of the most remarkable phenomena among insects ____ the use of chemicals to bring the mates together.
(A) are
(B) be
(C) being
(D) is
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統計: A(10), B(10), C(37), D(67), E(0) #1133773
統計: A(10), B(10), C(37), D(67), E(0) #1133773