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
考查非謂語動詞與人稱代詞。句意：一些孩子被看到整個上午都在花園里玩�？隙ㄊ撬麄儼瘟诉@些花。現(xiàn)在分詞做狀語表示句子主語正在進(jìn)行的伴隨性動作。下文人稱代詞為從句的邏輯主語，故需用主格形式，選A。
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