I don’t know _________.
A．whattodoitB．howtodoC．whattodoD．todowhat
C
考查非謂語動(dòng)詞. 疑問詞加不定式作用相當(dāng)于一個(gè)賓語從句，句意:我不知道做什么.選項(xiàng)AD結(jié)構(gòu)有誤,選項(xiàng)Bhow不能做賓語,故選C.
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