-Where is our English teacher? -She is in the classroom, the exercises the stude
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—Where is our English teacher?
—She is in the classroom, __________ the exercises ________the studentshave done at home.
A. explaining; / B.explaining;for
C.explained; to D.explained;from
试题答案
答案：A
解析：| 本题考查非谓语动词和介词的用法。分析句子结构，第一处为现在分词做伴随状语，后面为定语从句，因引导词修饰先行词exercises，并在定语从句中作have done的宾语，所以省略了。注意：此处容易误选C，把它看作explain sth. to sb. 的用法。所以必须分清句子结构。
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