一 When did the computer crash?一 This morning, while I the reading materials downloaded from some websites.
#102121
A
have sorted
B
was sorting
C
am sorting
D
had sorted
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The real reason for the fire _______ a burning cigarette end.
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A
starts with
B
leads to
C
focuses on
D
lies in
3. He is teaching in his hometown now, but he________ in a hospital for 10 years.
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A
worked
B
has worked
C
had worked
D
has been working
Though we don’t know what was discussed, yet we can feel the topic_____.
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A
had changed
B
will change
C
was changed
D
has been changed
Teenagers _____their health because they play computer games too much.
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A
have damaged
B
are damaging
C
damaged
D
will damage
--- An ant has two stomachs --- one for itself, one for others.--- Really? Quite interesting. I ____ anything about it.
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A
don’t know
B
have known
C
haven’t known
D
didn’t know