Much to the couple’s comfort, their income is now double ________ it was five years ago.
A．thatB．thanC．whichD．what
D
考查名詞性從句。What在從句中作表語(yǔ)，句意：使這對(duì)夫婦安慰的是，他們的收入是五年前的兩倍。
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