I won’t tell the student the answer to the math problem until he ____on it for more than an hour.
#99288
A
has been working
B
will have worked
C
will have been working
D
had worked
推荐题目
I believe that those mountains ________ with trees in a few years’ time.
#102710
A
are covered
B
will be covered
C
are covering
D
will cover
Although some athletes _______ their sports ambitions , there are still many more struggling for success .
#101746
A
achieved
B
will achieve
C
have achieved
D
had achieved
I don’t understand why they don’t have the report. It _________ to them a week ago.
#99517
A
is sent
B
was sent
C
will be sent
D
had been sent
The man whose songs we are fond of ____ in our city next week．
#104221
A
singing
B
to sing
C
will sing
D
sang