55. All students in the class a loud laugh when the professor told them a joke.(A) let up(B) let dow

問題詳情

55. All students in the class a loud laugh when the professor told them a joke.
(A) let up
(B) let down
(C) let off
(D) let out

答案：D
難度：困難0.285714
統計：A(1),B(1),C(2),D(2),E(0)