______,theboycouldn'tenterhishouse.A.SincethekeyhadlostB.Thekeybein

发布时间：2020-08-06 09:22:13

______, the boy couldn't enter his house.A.Since the key had lostB.The key being lostC.Lost the keyD.Having lost the key

网友回答

B解析主语不同，分词构成独立主格。不选D, 因为句中强调的不是先后顺序，而是强调原因。
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