单项选择题

An increase in global temperatures could cause many changes, among ______ the amount and pattern of precipitation resulting in floods and drought.

(A) that
(B) this
(C) them
(D) which
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单项选择题
Unless we can be ______ for an event like this and change our strategies, the company will still be in the red for the foreseeable future.
(A) prepare
(B) prepared
(C) preparatory
(D) preparation
单项选择题
To help improve the image of the company, the secretary ______ to write a brief report whenever he receives a complaint from a customer.
(A) requires
(B) requiring
(C) is required
(D) required
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