I would have helped you, but I       __ really occupied the whole week.
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A
was
B
am
C
had been
D
were
推荐题目
By the time he was twelve, Edison _______ to make a living by himself.
#101794
A
would begin
B
has begun
C
had begun
D
began
Only a small percentage of the graduates ___________________ a job. 
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A
have been offered
B
have offered
C
has been offered
D
has offered
Don’t disturb me. I_______ letters all morning and have written ten so far.
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A
have written
B
am writing
C
was writing
D
have been writing