I was out of town at the time，so I don’t know exactly how it ________.
#99406
A
was happening
B
happened
C
happens
D
has happened
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The news came as no surprise to me . I ____ for some time that the factory was going to shut down .
#100286
A
knew
B
know
C
have known
D
had known
Mrs. Black would rather his husband did some housework when he’s free, but he _______.
#103537
A
wouldn’t
B
didn’t
C
doesn’t
D
wasn’t
I know a little bit about Italy as my parents and I there several years ago.
#101800
A
are going
B
had been
C
went
D
has been
Excuse me.I ________ I was blocking your way.
#99576
A
didn't realize
B
don't realize
C
haven't realized
D
wasn't realizing
Although the causes of cancer_____, we do not yet have any practical way to prevent it.
#104936
A
are being uncovered
B
have been uncovering
C
are uncovering
D
have uncovered