【題目】Jack cleans the blackboard every day. ( now改寫句子 )

Jack ________ ________the blackboard now.

【答案】is cleaning

【解析】

now作時(shí)間狀語,謂語用現(xiàn)在進(jìn)行時(shí)be doing。主語Jack是第三人稱單數(shù)形式,謂語用第三人稱單數(shù)形式。故填(1). is (2). cleaning

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