Linda was______the experiment a month ago, but she changed her mind at the last

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问题 Linda was______the experiment a month ago, but she changed her mind at the last minute. （2007年考试真题）

选项 A、to start
B、to have started
C、to be starting
D、to have been starting

答案 B

解析本题考查was／were+to have done sth．结构，表示“过去想做而未做的事”。

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