题目内容

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