给你举个例子吧! 这是prep中的一道语法题: 14.(25209-!-item-!-188;#058&001758)
Having finally reached a tentative labor agreement with its company's pilots, it must now be determined by the airline's board of directors how the airline can both increase profits and compete more effectively for customers than they did in the past.
(A) it must now be determined by the airline's board of directors how the airline can both increase profits and compete more effectively for customers than they did in the past
(B) it must now be determined by the airline's board of directors how the airline can both increase profits and must compete more effectively than in the past for customers
(C) the airline's board of directors must now determine both how to make the airline increase profits and compete more effectively for customers than they did in the past
(D) the airline's board of directors must now determine how the airline can both increase profits and compete more effectively for customers than it did in the past
(E) the airline's board of directors must now determine how the airline can both increase profits and also how to make it compete more effectively than in the past for customers
这一道题,句子开头是非谓语部分having........所以句子主语也必须是前面这个having finally reached... 的主语,it不可能,所以根据句意就应该是人类,即CDE中的the airline's board of directors. 瞬间排除AB。考试经常遇到这类题。
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