单项选择题

Paper ______ in China.

A. is invented
B. was invented
C. has invented
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单项选择题
His father ______ for a week.
A. was died
B. has been dead
C. has died
单项选择题
The twins go to school ______ foot and go home ______ bus.
A. on; by
B. by; on

C. with; in
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