The zoo keeper is worried because the number of visitors ______ smaller and smaller .
A.is becomingB.becomeC.becameD.to become
A

試題分析:動(dòng)物園飼養(yǎng)員很擔(dān)心,因?yàn)橛慰偷臄?shù)量越來越少。結(jié)合語境可知下文為原因狀語從句,描述的是現(xiàn)在正在進(jìn)行的動(dòng)作,故用現(xiàn)在進(jìn)行時(shí)態(tài),選A。
點(diǎn)評(píng):英語中的時(shí)態(tài)主要是借助于時(shí)間狀語與上下文語境來進(jìn)行判斷。解答此類題型,首先要注意句子中的時(shí)間狀語,如果沒有則要通過分析上下文,結(jié)合語境來判斷句子的時(shí)態(tài)。英語疑問句中一般具有時(shí)態(tài)上的對(duì)應(yīng)關(guān)系,注意結(jié)合這一特點(diǎn)進(jìn)行區(qū)分。
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