Their coming without notice really                    our difficulties.
A．a(chǎn)dded
B．a(chǎn)dded up
C．was added to
D．a(chǎn)dded to
D
add可以作為及物動詞，構(gòu)成“add...to”，表示“把……加到……上”；也可以用作不及物動詞，構(gòu)成短語 add to...，表示“增添，添加”； add up to則表示“共計”。
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