单项选择题

I am not certain whether he will come.

A. determined
B. sure
C. sorry
D. glad
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单项选择题
I had some difficulty in carrying out the plan.
A. making
B. keeping
C. changing
D. implementing
单项选择题
Even in a highly modernized country, manual work is still needed.
A. physical
B. mental
C. natural
D. hard
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