单项选择题

It takes a long time and a lot of money ______ a modern farm.

A. developing
B. to develop
C. developed
D. develop
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单项选择题
Mary wasn’t at home, （） I left a note.

A. since
B. while
C. or
D. so
单项选择题
Nothing would （） him from telling the truth.

A. predict
B. present
C. prevent
D. prefer
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