第一题：
答案：A
what to do 表示“做什么”,what 作do的宾语,而how 是疑问副词,不能充当do的宾语,do后面加it才对.
第二题：
答案：D
此句用的是it be + adj.+ to do sth.句型,it 作形式主语,动词不定式结构作真正的主语.cook 表示“烹饪”,在此是不及物动词,后面不必加it,所以正确答案是D.
what to do 与how to do
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