单项选择题

Due to her attendance at the annual librarians' conference, Ms. Monroe will be out of the office ______ Tuesday.

(A) at
(B) since
(C) until
(D) behind
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单项选择题
If airport authorities consider it ______ to shut down the entire terminal for security reasons, they should be allowed to do so.
(A) necessity
(B) necessitate
(C) necessary
(D) necessarily
单项选择题
Because employees were forced to arrive at work ______ than usual this morning, they will be allowed to leave at 4:00 pm.
(A) early
(B) earliness
(C) earliest
(D) earlier
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