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The old lady did not know ___________when the house caught fire.
A．how to doB． what to do
C． how to do it D．what to do it.
B

試題分析：句意：當房子著火的時候，那位女士不知道做什么。因為do是及物動詞，所以需要賓語，how不能作賓語；故排除A；如果用疑問詞what，它可以作do的賓語，就沒有必要用it，故排除D；故選。
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