单项选择题

I can hardly imagine Peter () across the Atlantic Ocean in 15 days.

A. sail
B. to sail
C. sailing
D. to have sailed

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单项选择题
Do () you think is fight () difficulties you may have.

A. what...however
B. that...what
C. whatever...whoever
D. what...whatever
单项选择题
()a lot of money made the study abroad possible for him.

A. Tom saved
B. Tom has saved
C. Tom's having been saved
D. Tom's having saved
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