Much to the couple’s comfort, their income is now double it was five years ago.A. thatB.

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A. that
B. than
C. which
(答案→)D. what
解析： 考查宾语从句。is now double是谓语部分，所以后面跟的是宾语从句，宾从     it was five years ago缺少was的表语，所以用what引导。选D。