单项选择题

A．how
B．what
C．which
D．why
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单项选择题
When does the man work everyday
A．From eight to five.
B． From nine to five.
C． From eight to four.
单项选择题
A．importantB．certainC．interestingD．difficult
A．important
B．certain
C．interesting
D．difficult
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