問題詳情

33．The country has already sent up three unmanned spacecraft, the most recent ---------at the end of last March.
(A)has been launched
(B)having been launched
(C)being launched
(D)to be launched

參考答案

答案：D
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)