Had electronic computers not been invented, many problems on space flight______.

游客2024-08-16 38

问题 Had electronic computers not been invented, many problems on space flight______.

选项 A、could not have been solved
B、could not be solved
C、can not be solved
D、could not have solved

答案 A

解析

转载请注明原文地址:http://tihaiku.com/zcyy/3722810.html

相关试题推荐

随机试题

最新回复(0)

Livinginthewesternpartofthecountryhasitsproblems,______obtainingfres