问题
选择题
_____, the boy couldn't enter his house.
A．Since the key had lost
B．The key being lost
C．Lost the key
D．Having lost the key
答案
答案：B
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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_____, the boy couldn't enter his house.
A．Since the key had lost
B．The key being lost
C．Lost the key
D．Having lost the key
答案：B
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。