His uncle has not been back ( ) he left home three years ago.A forB atC sinceD about选那个?

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His uncle has not been back ( ) he left home three years ago.A forB atC sinceD about选那个?
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His uncle has not been back ( ) he left home three years ago.A forB atC sinceD about选那个?
His uncle has not been back ( ) he left home three years ago.
A for
B at
C since
D about
选那个?

His uncle has not been back ( ) he left home three years ago.A forB atC sinceD about选那个?
C,看时态就选出答案了,since 用于现在完成时,自从他的叔叔三年前离开家,他就再也没回来了.

C 他的叔叔离家出走三年没回来了。

C. SINCE. 自从的意思