He took care of the boy ________ he were his own son.(Unit10-9)

题目

He took care of the boy ________ he were his own son.(Unit10-9)
A.become?B.as though?C.for?D.even though
为什么选B不选其它?请分析一下语境.

答案

as though = as if 意思是 好像,象什么一样
他照看这个男孩就像男孩是他自己的儿子一样.
a 和 c显然不对,even though 是虽然的意思
“他照看这个男孩虽然他是他自己的儿子”.意思明显不对,所以选b