Some children were seen _______in the garden all the morning. It must have been _______who picked the flowers.
A．playing; theyB．to play; theyC．playing; themD．play; them
A
考查非謂語(yǔ)動(dòng)詞與人稱代詞。句意：一些孩子被看到整個(gè)上午都在花園里玩�？隙ㄊ撬麄儼瘟诉@些花�，F(xiàn)在分詞做狀語(yǔ)表示句子主語(yǔ)正在進(jìn)行的伴隨性動(dòng)作。下文人稱代詞為從句的邏輯主語(yǔ)，故需用主格形式，選A。
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