单项选择题

I'm sure ghosts do not exist. ______ I have never seen one.

A. First of all
B. Now and then
C. Day and night
D. At least
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单项选择题
______ two exams to worry about, I have to work really hard this weekend.
A. With
B. Besides
C. As for
D. Because of
单项选择题
Teachers are not happy when they find in class their students sending ______ to their friends by mobile phone.
A. letters
B. messages
C. notes
D. informations
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