单项选择题

To facilitate our efficiency, management has purchased more than 50 desktop computers, many of ______ are to be installed in the accounting section.

(A) them
(B) it
(C) what
(D) which
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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
单项选择题
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
(D) has
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