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
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—Tony, you must have noticed the student who broke the glass.—I'm sorry.I________attentively.
#99685
A
studied
B
was studying
C
am studying
D
would study
---You phone number again? ---I ___ quite catch it---It is 3453789..
#104023
A
didn’t
B
couldn't
C
don’t
D
can’t
--I have you asked John to come to the party this evening？--Yes，I have，but he＿＿＿＿
#100482
A
doesn't
B
hasn't
C
hadn't
D
won't
We_______on this project for four hours. Let’s have a rest.
#103758
A
are working
B
have been working
C
worked
D
had worked