单项选择题

Please wait ______ the elevator door to close automatically in order to conserve energy.

(A) of
(B) for
(C) by
(D) until

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单项选择题

The newly adapted diagram ______ that the corporation' s profits are diminishing in size.

(A) shows
(B) supports
(C) surrogates
(D) suppresses

单项选择题

Its consumers have a sincere interest in the behavior of the company ______ they place their trust.

(A) which
(B) in which
(C) whose
(D) whichever

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