考古題 0310 structure #9

[epoch]

(9)From colonial times ,United States property owners agreed
to tax themselves on the theory......directly from services
that the government could provide.
(a)property owners benefited so that
(b)why property owners benefited
(c)that if property owners benefited
(d)that property owners benefited

答案是d 請問要如何解釋呢(我選了c)

[Calvin]

C接了if 子句，那請問that 後的主要子句在那�呢？

that接一名詞子句，說明theory的內容