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Their coming without notice really                    our difficulties.
A.added
B.added up
C.was added to
D.added to
D
add可以作为及物动词,构成“add...to”,表示“把……加到……上”;也可以用作不及物动词,构成短语 add to...,表示“增添,添加”; add up to则表示“共计”。
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