The computer was invented in the 1940’s and ______ quite a lot ever since.
#100726
A
was changed
B
had changed
C
has been changed
D
will change
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—Is there any possible way to help them get rid of such a bad habit?—To tell the truth, it’s very hard. But we ________ on this problem, trying to improve the situation .
#101218
A
worked
B
had worked
C
are working
D
had been working
We ________ to go skiing tomorrow，but there’s no snow，so we’ll just stay home instead。
#104762
A
are going
B
were going
C
will go
D
would go
I would have gone to my cousin’s birthday party last night, but I ______ available.
#100506
A
was
B
had not been
C
was not
D
would not be
---What ‘s the matter with you? --- You _____ my heart. - -- But I didn’t mean to hurt you.
#102840
A
broke
B
are breaking
C
had broken
D
have broken