ithey understand how important—.A is to know English B knowing English is C knowing is EnglishD to is know English

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itheyunderstandhowimportant—.AistoknowEnglishBknowingEnglishisCknowingisEnglishDtoisknowEnglishithey

ithey understand how important—.A is to know English B knowing English is C knowing is EnglishD to is know English
ithey understand how important—.A is to know English B knowing English is C knowing is English
D to is know English

ithey understand how important—.A is to know English B knowing English is C knowing is EnglishD to is know English
选B,how important knowing English is 是宾语从句,宾语从句语序需要用陈述句语序,所以是knowing English is,knowing English整个作主语,其实就是Knowing english is important.