— Spacecraft "Discovery" has failed in the course of launch.— ________? They have been pre

题目简介

— Spacecraft "Discovery" has failed in the course of launch.— ________? They have been pre

题目详情

— Spacecraft "Discovery" has failed in the course of launch.
— ________? They have been preparing for the test.
[      ]
A. How come  
B. When
C. How  
D. Why not
题型:单选题难度:中档来源:专项题

答案

A

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