【題目】I really don't know .
A.what to do
B.how to do
C.to do what
D.how can I do

【答案】A
【解析】句意：我真的不知道怎么辦。疑問(wèn)詞+不定時(shí)在句中作賓語(yǔ)，what to do后面不再有賓語(yǔ)，how to do后需用it作賓語(yǔ)。故選A。

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