单项选择题

21()

A.failed
B.wrote
C.received
D.chose

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单项选择题

The ball was probably invented because______.

A. throwing stones often caused injuries
B. throwing stones was not fun
C. games with stones did not have roles
D. rocks were too heavy to throw

单项选择题

What are you busy ______ I am busy ______ the plan for the sports meeting. ()

A. in... to make
B. about... to make
C. in... making
D. about... making

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