问题
选择题
He left home in 1980 and has never come back ____.
A．though
B．while
C．when
D．since
答案
D
省略句since he left home in 1980
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He left home in 1980 and has never come back ____.
A．though
B．while
C．when
D．since
D
省略句since he left home in 1980