________hehasbeenlivingonadifferentplanet,heprobablykno...
问题详情：
________ he has been living on a different planet, he probably knows that there's a new version of Windows—it's called Vista.
A. Once B. Unless C. Though D. If
【回答】
B
知识点：连词
题型：选择题
问题详情：
________ he has been living on a different planet, he probably knows that there's a new version of Windows—it's called Vista.
A. Once B. Unless C. Though D. If
【回答】
B
知识点：连词
题型：选择题
