But for friction (摩擦力), people ______ neither walk, nor even stand up.
#86752
A
can
B
were able to
C
will be able to
D
could
推荐题目
I ______ sooner but I didn’t know that they were waiting for me.
#87679
A
had come
B
was coming
C
would come
D
would have come
You didn’t let me drive. If we ______ in turn, you ______ so tired.
#87358
A
drove…didn’t get
B
had driven…wouldn’t have got
C
drove…wouldn’t get
D
were driving…wouldn’t get