单项选择题

（）with the size of the whole earth, the highest mountain does not seem high at all.

A. When compared
B. When comparing
C. Compare
D. Comparing

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单项选择题

A. could not have been solved
B. could not be solved
C. must not be solved
D. should not have been solved

单项选择题

A.on
B.over
C.in
D.of

单项选择题

A. confusing
B. confused
C. with confusion
D. to confusion