【題目】______ in thought, he failed to realize his mother’s approach.

A.LosingB.Being lostC.LostD.To be lost

【答案】C

【解析】

考查非謂語動詞。句意：他陷入沉思，沒有意識到母親的到來。短語lost in thought“沉浸在思考中”，本句中l(wèi)ost做狀語，故選C。

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