单项选择题

Some of his suggestions had been rejected () they were not practicable.

A. as
B. when
C. until
D. if

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It is essential that people () enough vitamins every day.

A. have
B. had
C. must have
D. will have

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I'll give you my telephone number in case you () want to get in touch with me again.

A. should
B. will
C. shall
D. need

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