_______ is a fact that English is being accepted as an international language.
A、ThereD
為了保持句子的平衡，往往用先行詞it作形式主語或形式賓語，而把真正的主語或賓語放到后面，尤其是that引導的主語從句往往用先行詞it作形式主語。此句也可以改寫為：ThatEnglishisbeingacceptedasaninternationallanguageisafact.
Thisisanimportantproblem_______toofewsocialscientistshaveresearched.
Childrenhaveanatural________abouttheworldaroundthem.
Hetalkedalotaboutthingsandpersons________theyrememberedintheschool.
Hesaidthatthegroup________himaletterandaskedhimtogothereforaninterview.
Itwasasmallplacethencomparedto_______itisnow.
