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16.This is the______photo I have ever taken.A worse B better

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16.This is the______photo I have ever taken.A worse B better C best Dmost worst 17.As they can't afford to let the situation get worse,they will take some necessary ___.A decisions B sides C directions D steps 18.The girl sometimes has difficulty______what the teacher say in class.A understand B understanding C to understand D understood 19.You ___ yesterday if you were really serious about the job.A ought to come B ought to be coming C ought to have come D ought have come 20.Milk bottles need cleaning thoroughly before they are used again,___ they?A don't B mustn't C needn't D aren't
16.D这里需要最高级 17.Dtake steps采取措施 18.Bhave difficulty+doing 19.C与过去事实相反的虚拟语气ought to+have+过去分词 20.A 反义疑问句,前面是肯定句,所以后面用否定形式.