【題目】—What _________ your teacher _________ now?
—He is cleaning his office.
A.are, doing
B.is; doing
C.are; do
D.is; do

【答案】B
【解析】考查現(xiàn)在進(jìn)行時(shí)!粳F(xiàn)在進(jìn)行時(shí)】表示說話時(shí)正在進(jìn)行或發(fā)生的動(dòng)作,也可表示當(dāng)前一段時(shí)間內(nèi)的活動(dòng)或現(xiàn)階段正在進(jìn)行的動(dòng)作.結(jié)構(gòu):助動(dòng)詞 be ( am / is / are ) +現(xiàn)在分詞。句意:你的老師在做什么?他在打掃辦公室。老師是第三人稱單數(shù),使用助動(dòng)詞 is。所以答案是 B。

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