They ___________ for two hours
#102329
A
is working
B
worked
C
have been working
D
had worked
推荐题目
So far, no agreement ________ on which type of exercise is best suitable for keeping fit.
#99157
A
has reached
B
has been reached
C
was reached
D
had been reached
More than a dozen students in that school ____ abroad to study medicine last year.
#101410
A
sent
B
were sent
C
had sent
D
had been sent
--Why does the lake smell terrible? -- Because a large amount of water_______.
#99621
A
have polluted
B
is being polluted
C
has been polluted
D
have been polluted
—Jim,have you finished reading Harry Potter and Half-Blood Prince?—No.I______ my father on the farm all day yesterday.
#104374
A
would help
B
had helped
C
was helping
D
have been helping
It’s the third time he _________with her in a week.
#101319
A
had quarreled
B
quarreled
C
has quarreled
D
quarreling