Being a teacher always encouraging students to think for themselves, I won't tell them answers until they __________ on a math problem for more than an hour.
#101395
A
have worked
B
will have worked
C
will have been working
D
had worked
推荐题目
Many a school and many a hospital ______ since 1949.
#103824
A
have set up
B
has set up
C
have been set up
D
has been set up
The country life he was used to ______ greatly since 1998.
#102492
A
change
B
has changed
C
changing
D
had changed
In no time ________ smoke coming out of the house.
#101549
A
did we see
B
we saw
C
are we seeing
D
we see
When I said someone broke the school regulations, I ______ you. Why did you get that angry?
#102547
A
don’t refer to
B
haven’t referred to
C
wasn’t referring to
D
hadn’t referred to
—Did you ring her last night?—Yes, I her, but she wasn’t at home.
#103560
A
really ring
B
did ring
C
did rang
D
do ring