問題詳情

50. A large number of students ______ for the class, so we need a bigger room.
(A) sign up
(B) signs up
(C) have signed up
(D) has signed up

參考答案

答案:C
難度:適中0.480634
統計:A(396),B(85),C(546),D(109),E(0)

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