单项选择题

Having used up her sick leave while in the hospital, Mary had no option but ______ personal leave instead.

(A) using
(B) use
(C) to use
(D) by using
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单项选择题
The purpose of this system is ______ trade flow as freely as possible, making sure that there are no undesirable side-effects.
(A) help
(B) to help
(C) helping
(D) in helping
单项选择题
The CEO is now faced with a decision whether to downsize the ______ current operations or lay off 500 employees.
(A) addition
(B) an addition of
(C) an additional
(D) in addition
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