The missing boys were last seen _______ near the river.
A．to playB．to be playing
C．playD．Playing
D

試題分析：考查感官動(dòng)詞的復(fù)合結(jié)構(gòu)。所填的詞為主語補(bǔ)足語，因其后有明確的地點(diǎn)，補(bǔ)足語表示動(dòng)作當(dāng)時(shí)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)。句意：這個(gè)失蹤的男孩最后一次被看到時(shí)正在河邊玩。
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