---Who cleaned the blackboard yesterday, Dick?
---John ____.
A．cleanB．doesC．didD．is
C

試題分析：句意：--Dick，昨天是誰清掃的黑板？--John做的。分析上文的工作是過去動作，下文對同樣的動作要用助動詞來代替，體現(xiàn)為過去時用did來進行替換。故選C
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