I wrote a letter to John for his help during my high school years,without which I ________  the college entrance exam.
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A
would fail
B
would have failed
C
should fail
D
must have failed
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I ______ through that bitter period without your generous help.
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A
couldn’t have gone
B
didn’t go
C
wouldn’t go
D
hadn’t gone
You____me my bike yesterday afternoon; I needed it so badly.
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A
should have returned
B
should return
C
must return
D
must have returned
Don’t handle the vase as if it _________ made of steel.
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A
is
B
were
C
has been
D
had been