单项选择题

I didn’t send out my application form last week, but I ______.

A. had to
B. would
C. must

D. should have
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单项选择题
______ the earth to be flat, many feared that Columbus would fall off the edge of the earth.
A. Having believed


B. Believing
C. Believed



D. Being believed
单项选择题
Just as the soil is a part of the earth, ______ the atmosphere.
A. as it is
B. the same is
C. so is

D. and equally is
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