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
— You ought to have called her yesterday . — Yes , I know I ____ .
#89767
A
ought to
B
ought go have
C
ought have done
D
ought to have called
The policeman _______ that the drunk driver get out of his car.
#86349
A
said
B
commanded
C
connected
D
thought
She________the opportunity，but unfortunately she just let it go.
#86619
A
should have taken
B
must have taken
C
needn't have taken
D
can't have taken
Mike is often absent from class.” “Tell him he _________ answer for it if he goes on behaving like that.”
#89116
A
shall
B
will
C
would
D
can