单项选择题

To increase efficiency, the president demanded that we ______ the operating system and update most of the software we use.

(A) change
(B) can change
(C) changed
(D) have changed
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The CEO ______ us to work at our own pace, so we can leave the office anytime we want to during the day.
(A) lets
(B) allows
(C) makes
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单项选择题
To tell you the truth, never before ______ seen so many candidates competing for so few vacancies our company has to offer.
(A) we have
(B) we had
(C) have we
(D) had we
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