单项选择题

To help improve the image of the company, the secretary ______ to write a brief report whenever he receives a complaint from a customer.

(A) requires
(B) requiring
(C) is required
(D) required
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单项选择题
Almost one third of all Americans are employed in marketing-related positions, so the number of possible marketing careers is ______.
(A) enormous
(B) tiny
(C) insignificant
(D) invisible
单项选择题
______ you have any problems with the machine, consult Mr Paul N. Hiatt, who is one of the most experienced mechanics in our factory
(A) Had
(B) Would
(C) Should
(D) Were
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