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

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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

单项选择题

Although punctual himself, the person was quite used ______ late for his lecture.

A. to have students

B. for students being
C. for students to be

D. to students’ being

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