单项选择题

All life on the earth ______ on the sun.

A. depends
B. carries
C. keeps
D. goes
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单项选择题
The old gentleman never fails to help ______ is in need of his help.
A. who
B. whoever
C. one
D. whomever
单项选择题
My wallet is nowhere to be found. I______ when I was on the bus.
A. must drop it
B. should have dropped it
C. must have dropped it
D. had dropped it
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