prep1-14关于形式主语it指代that从句的问题

OwenBBB

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

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and also how to make it compete more effectively than in the past for customers  
key：D

(A) 不符合形式主语的使用规则,how前面要加上that,构成it is… that型主语从句; it没有指代对象

且不能作为having finally reached的逻辑主语; they没有指代对象,应该改为it,用来指代the airline.

A选项的关于形式主语的解释是否有flaw啊？好像没见过有it ...that 再加从句的例子