问题
选择题
The tables and pictures help make ________ clear ________I wasn't sure of before.
A．it; for me to understand what
B．it; everything
C．everything; to understand what
D．/; what
答案
A
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。