______ he came to have such a valuable painting is a mystery.

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问题 ______ he came to have such a valuable painting is a mystery.

选项 A、How
B、That
C、What
D、Which

答案A

解析。本题考查主主语从句的引导词how表示方式，意为“怎样，如何”，符合题意。故选A。

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英语

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