No matter how frequently ______, the works of Beethoven always attract large audiences.

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问题 No matter how frequently ______, the works of Beethoven always attract large audiences.

选项 A、performed
B、performing
C、to be performed
D、being performed

答案A

解析 在时间、条件状语从句中,当从句主语和主句主语一致的时候,可以将从句的主语和be的变化形式省略。但如果从句省略了主语和be的变化形式,而主句主语和从句主语却不一致,这时该状语从句就成了悬垂从句,如;*Although seriously damaged by the earthquake of l917,restoration work has almost brought the cathedral back to its original beauty.(damage和句子主语the restorati
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