Every month, Mrs. Smith ______ all her bills before she pays them.

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问题 Every month, Mrs. Smith ______ all her bills before she pays them.

选项 A、adds into
B、adds to
C、adds up to
D、adds up

答案D

解析  根据题意应选D。即adds up加算,合计。其他词辨义:A.adds into往……里添加; B.adds to增添;C.adds up to相加起来。
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