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Itis()thatascientificreasearchmustbegin.为什么用withsuchfacts而不用bysuchfacts

题目详情
It is ( ) that a scientific reasearch must begin.为什么用with such facts 而不用 by such facts
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强调句你把It is ...that拿掉
a scientific reasearch must begin ()such facts
明显不?begin with还是begin by?