The missing boys were last seen ___ near the river.

A. playing  B. to be playing  C.play   D. to play

A


解析:

see 后可接do或doing作賓語補(bǔ)足語，前者表示動(dòng)作全過程，后者表示動(dòng)作的進(jìn)行，此題關(guān)鍵詞是 last。

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