These achievements_______ without the contribution of Qian Xuesen, a key leader of the New China's nuclear, missile and so on．
#89859
A
would have been unthinkable
B
would not be unthinkable
C
would be unthinkable
D
would not have been unthinkable
推荐题目
一How dangerous it was!—Yes，but for the young man’s quick action，he_________ run over by the car．
#86560
A
must have been
B
could have been
C
would be
D
might be
I didn’t find his office. If only I______his address!
#90228
A
remember
B
remembered
C
had remembered
D
would remember
---- Did you visit the Big Ben in London?---- No, we ______ it, but we spent too much time shopping.
#90301
A
could visit
B
could have visited
C
must ahave visited it
D
can have visited