Before the first nonstop flight made in 1949, it_____ necessary for all planes to land for refueling.
#101489
A
would be
B
has been
C
had been
D
would have been
推荐题目
You must do your homework now; you ________ computer games all the evening.
#101744
A
have been playing
B
are playing
C
play
D
played
____ to hospital in time, the wounded soldiers were saved at last.
#101566
A
Taken
B
Taking
C
Having taken
D
Being taken
---Hi, Dave. This is Helen speaking!---Hi, what a coincidence! I _____ about you.
#100383
A
was just thinking
B
just thought
C
have just thought
D
would just think
Would you please keep silent? The weather report and I want to listen.
#101657
A
is broadcast
B
has been broadcast
C
is being broadcast
D
was broadcast
After the examination，my teacher told me that failure _______the mother of success.
#102951
A
was
B
is
C
be
D
been