—I don’t understand why you didn’t go to the lecture yesterday afternoon.—I’m so sorry.But I________my homework. (2013·湖南，34)
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A
had done
B
was doing
C
would do
D
am doing
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Lisa, now stop for a short break. You should know that you all the morning.
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A
are working
B
had been working
C
have been working
D
have worked
So far this year we _________ a fall in house prices by between 5 and 10 percent.
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A
saw
B
see
C
had seen
D
have seen
.---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
．The news came as no surprise to me. I ______ for some time that I would fail in the exam.
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A
had known
B
knew
C
have known
D
know