(2014·天一一中检测)It just isn’t fair;________I was working as a waiter last month,my friends were lying on the beach.
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A
whenever 
B
though
C
for 
D
while
推荐题目
___ is the most useful invention?
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A
Do you think which of these
B
Which of these you know
C
Which of these do you know
D
You know which of these