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Wasitbycuttingstaff()shesavedthefirm?No,itwasbyimprovingworkefficiency.a.whenb.whatc.howd.that请详解

题目详情
Was it by cutting staff( )she saved the firm?No,it was by improving work efficiency.
a.when b.what c.how d.that 请详解
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答案和解析
答案选d.that
这是it is/was.that.强调句型