The tables and pictures&n

The tables and pictures help make ________ clear ________I wasn't sure of before.A.it; for me to understand whatB.it; everythingC.everything; to understand whatD./; what

参考答案：
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。