(   ) 3. I always forget some new words. I'm very upset and don't know___________ 

A. how to do    B. when to do

C. what to do    D. where to do

3. C考査"疑問詞+不定式"結(jié)構(gòu)。what to do意 為"做什么"，what是do的賓語(yǔ)。根據(jù)句意應(yīng)是我不知道該做什么。故選C。另外,A、B、D項(xiàng)從結(jié)構(gòu)上來說都缺少賓語(yǔ)，即應(yīng)為how/when/where to do sth.

題目來源：仁愛英語(yǔ)同步練習(xí)簿九年級(jí)上下冊(cè) > Review of Unit 3

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