(2013·哈尔滨四校高三统一检测)Look! There are so many mistakes in your composition. You ________ have fixed full attention on it.
#86572
A
can
B
should
C
need
D
might
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.— Why didn’t you tell me the truth that day? — I _____, but you _____ for Fuzhou when I went to see you.
#88309
A
did; would leave
B
would; have left
C
would have; had left
D
had; left
If they had known what was coming next, they __ their mind.
#87344
A
may change
B
could change
C
must have changed
D
might have changed
I________you a beautiful present for your birthday,but I was short of money at that time. 
#89910
A
would buy
B
had bought
C
would like to have bought
D
must have bought