问题补充:
单选题Thetablesandpictureshelpmake________clear________Iwasn sureofbefore.A.it; for me to understand whatB.it; everythingC.everything; to understand whatD./; what
答案:
A解析it为形式宾语,后面的不定式作真正的宾语,what从句为宾语从句,what又在宾语从句中作of的宾语。
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