【題目】The missing boys were last seen ______ near the river.

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

【答案】A

【解析】句意：這個失蹤的男孩最后一次被看到時正在河邊玩。所填的詞為主語補足語，因其后有明確的地點，補足語表示動作當(dāng)時正在進(jìn)行中，所以只能使用playing。也就是說，這里使用的是see sb. doing sth.這一結(jié)構(gòu)，而不是see sb. do sth.這一結(jié)構(gòu)。選A

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