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She looks very sad. I want to help her , but I just don’t know_________ to do.
A．whatB．whenC．howD．where
D
“疑問(wèn)詞 + 動(dòng)詞不定式”是英語(yǔ)中常用的一種結(jié)構(gòu)。在句中可以作主語(yǔ)、動(dòng)詞或介詞的賓語(yǔ)以及表語(yǔ)。what 什么； when 什么時(shí)候；how怎樣；where在哪兒。句意：她看起來(lái)很傷心。我想幫助她。但是我只是不知道怎么幫。故選D。
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