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
As a fan of Harry Potter by J.K. Rowling, the talented young girl _______ reading all her_______.
#102602
A
is determined to; works
B
is bent on; works
C
focuses on; work
D
is used to; work
--- What are you busy with? --- The conference in our city next week.
#103322
A
held
B
to be held
C
be holding
D
will be held
My son __________ his clock when I went to get a cup I __________ in his study.
#103412
A
was winding up; had left
B
would up; had forgotten
C
had wounded; left
D
was winding up; forgot
—I wonder if you could go with me to the supermarket.—Sorry. I _______ my experiment report all the morning and haven’t finished yet.
#101229
A
write
B
was writing
C
have written
D
have been writing
In some parts of the world, tea _______ with milk and sugar.
#104046
A
is serving
B
is served
C
serves
D
served