【題目】______ exactly what was wrong with him, the doctors gave him a complete examination.

A. To discover B. Discovering C. Discovered D. Having been discovered

【答案】A

【解析】考查動詞不定式。句意：為了查明他到底怎么了，醫(yī)生給他做了一個完整的檢查。用動詞不定式表目的，故答案為A。

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