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