一道英语选择题说原因 就好·············.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

Question

一道英语选择题说原因 就好·············
.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

Answer 1

选B
前半句句意完整,可以推断“,”后面是一个状语从句 所以排除A
再看c being表示正在发生,而句字要表达的是完成的含义,所以排除C
而D选项 to be 表示将要发生,显然不合语境 所以排除
答案只能选B