50.All of the water in the river _____clean. Many people come and swim in it.(A) are (B) is (C) am (

問題詳情

50.All of the water in the river _____clean. Many people come and swim in it.
(A) are
(B) is
(C) am
(D) be

答案：B
難度：困難0.333333
統計：A(2),B(1),C(0),D(0),E(0)