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His coming _our happiness.A.added B.added to C.added up D.ad

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His coming _our happiness.A.added B.added to C.added up D.added for
为什么选C而不选B
答案应该选B.added to 不是 C.added up
add是增加某东西
add up是东西相加起来 these books add up to one million
add to是增添/增强某物的程度,如his coming adds to our happiness