He kept looking at her, wondering whether he ________ her somewhere.
A．sawB．has seenC．seesD．had seen
D
因?yàn)橛烧Z(yǔ)境可知，see應(yīng)當(dāng)發(fā)生在kept looking之前，即過(guò)去的過(guò)去，所以用過(guò)去完成時(shí)，只有D正確。
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