Our usual walk is to or from the subway, is how we get to work．
A. which
B. where
C. as
D. that
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(答案→)A. which
B. where
C. as
D. that
解析：句意：我们平日散步是往返于地铁间，这（坐地铁）也是他如何去上班的方法。从句缺主语，排除ＢD，where 关系副词作状语，that不能引导非限制性定语从句。which/as虽然都可以用于引导非限制性定语从句，但是两者还是有所区别的。which译成“这，这一点，这一件事上”。此句如果用as翻译成“正如/就像..一样”，句意明显不通。故选A。