The salesgirl a mistake.选项有 can make may make must make must have made

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The salesgirl a mistake.选项有 can make may make must make must have made
The salesgirl a mistake.选项有 can make may make must make must have made

The salesgirl a mistake.选项有 can make may make must make must have made
应选must have made,句意是,那个销售员一定犯了个错.

must have made肯定是犯了(错误)