一Isn't it a surprise that I happened to meet Francis Mathews at the Christmas party last week?一If my memory serves me correctly, you _____ each other for exactly two years.
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A
hadn't seen
B
haven't seen
C
didn't see
D
don’t see
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In the past twelve months the research members ______ the effectiveness of many materials in a home building.
#102889
A
had studied
B
would study
C
studied
D
have studied
The computer was invented in the 1940’s and ______ quite a lot ever since.
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A
was changed
B
had changed
C
has been changed
D
will change
.---David. I’ve lost my keys again. ---Here, not again！You______ your keys.
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A
always lost
B
always lose
C
are always losing
D
had been losing
---When will the expert come and give the lecture on economic development?---Not until our program_______.
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A
is approving
B
is to approve
C
has been approved
D
will be approved
Progress _____ so far very good and we are sure that the work will be finished on time.
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A
was
B
had been
C
has been
D
will be