单项选择题

The president of the college, together with the deans, ______ a conference for the purpose of laying down certain regulations.

A. is planning

B. are planning
C. are to plan

D. have planned

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单项选择题

The last half of the nineteenth century ______ the steady improvement in the means of travel.

A. has witnessed

B. was witnessed
C. witnessed

D. is witnessed

单项选择题

He would rather ______ part in such dishonest business deals.

A. resign than take

B. resign than to take
C. resign than taking

D. resigning than take

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