They have made a marvelous discovery;so we sent them an e-mail,____them on success

They have made a marvelous discovery;so we sent them an e-mail,____them on success

题目
They have made a marvelous discovery;so we sent them an e-mail,____them on success
A.congratulated B.gongratulating
答案
B从句.如果选A就两个主语了,不对
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