单项选择题

I have some difficulty ______ his heart disease

A. treats
B. treating
C. treated
D. to treat
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单项选择题
In the dark street, there was not a single person ______ she could turn for help.
A. that
B. who
C. from whom
D. to whom
单项选择题
I don't think Mr. Watson will come here again today. Please give the ticket to ______ comes here first.
A. whomever
B. whom
C. who
D. whoever
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