【題目】The assistant explained there were several doubtful points in the scheme he _______ difficult to understand.

A. was finding B. would find

C. had found D. has found

【答案】C

【解析】

試題分析：句意：助手解釋道，方案中有幾個(gè)疑點(diǎn)他覺(jué)得難以理解。動(dòng)作find發(fā)生在explained之前，應(yīng)用過(guò)去完成時(shí)。故選C項(xiàng)。

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