He has lived alone ______ he was eighteen.

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问题 He has lived alone ______ he was eighteen.

选项 A、about
B、since
C、at
D、by

答案B

解析本题考点是介词。Since的意思是“自从……”，且此句用的完成时态。本句大意：自从18岁以后他就独自一人生活了。

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大学英语三级A级

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