题目内容
________ it have been the failure to pick up directions from the ground control that caused the air crash?
[ ]
A.
Must
B.
Could
C.
Would
D.
Should
答案:B
练习册系列答案
相关题目
题目内容
________ it have been the failure to pick up directions from the ground control that caused the air crash?
Must
Could
Would
Should