10．The cleanershave swept（sweep）the street and it is quite clean now．

分析 清潔工已經(jīng)打掃了大街，現(xiàn)在街上很干凈了．

解答 本題考查的是現(xiàn)在完成時(shí)態(tài)的一種用法，表示過去發(fā)生的事對現(xiàn)在造成的影響和結(jié)果，本句話中 it is quite clean now就是已經(jīng)打掃的結(jié)果，故用
have swept．

點(diǎn)評 每一種特定的時(shí)態(tài)都有其相應(yīng)的時(shí)態(tài)標(biāo)志，尋找其時(shí)態(tài)標(biāo)志并加以認(rèn)真分析可以巧解時(shí)態(tài)試題．所謂時(shí)態(tài)標(biāo)志，指的就是某些特定的詞、短語或句式，在通常情況下要與某種特定的時(shí)態(tài)連用，同學(xué)們在做題時(shí)若能充分利用這些時(shí)態(tài)標(biāo)志，同時(shí)注意結(jié)合句子語境，就可很快得出正確答案．

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