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
I haven’t finished my homework yet. I my mother with the housework all day yesterday.
#101725
A
helped
B
have helped
C
was helping
D
have been helping
Great changes ________ in the village in the past two years.
#100133
A
have taken place
B
had taken place
C
were taken place
D
have been taken place
Don’t worry. Your dog _____good care of while you are away on holiday next week.
#102981
A
will take
B
is taking
C
will be taken
D
.has been taken
The play had already been on for quite some time when we _______ at the New Theatre.
#104060
A
have arrived
B
arrived
C
had arrived
D
arrive
—Has your father returned from Africa yet?—Yes,but he _______ here for only three days before his company sent him to Australia.
#104072
A
was
B
has been
C
will be
D
would be