16.-Mike,let's prepare for our baseball game.
-OK.We'll lose the game ______ we try our best.(  )
A.unlessB.onceC.afterD.since

分析 ---麥克,讓我們準(zhǔn)備棒球賽吧.
---好的,如果我們不盡力我們就會(huì)輸.

解答 答案:A.unless如果不,once曾經(jīng),after之后,since自從,結(jié)合We'll lose the game ______ we try our best用unless表示如果不,引導(dǎo)的條件狀語(yǔ)從句,故答案是A.

點(diǎn)評(píng) unless是從屬連詞,引導(dǎo)條件狀語(yǔ)從句,含有否定意義,相當(dāng)于if條件狀語(yǔ)從句的否定形式.所以u(píng)nless=if not.注意:unless引導(dǎo)的條件狀語(yǔ)從句和if條件狀語(yǔ)從句,與其它時(shí)間狀語(yǔ)從句一樣,用一般現(xiàn)在時(shí)代替將來(lái)時(shí).
1.Unless you take more care,you'll have an accident.
(如果不多加小心的話,你會(huì)出事故的.) 
2.My baby sister never cries unless she is hungry.
(我那剛出生的妹妹除非餓了,否則她是從來(lái)不哭的.) 
3.Unless bad weather stops me,I jog every day.
(除非壞天氣阻攔我,否則每天我都慢跑的.)

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