作业帮so far the students about 5000 treesA.have plantedB.had plantedC.plantedD.planthardly__he __the work when the Bell__A./,finished,rangB./,finshed,has rungC.had,finished,rangD.had,finished,had runghow long__you__the ditch?for 3 hoursA.have ,been diggin
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so far the students about 5000 treesA.have plantedB.had plantedC.plantedD.planthardly__he __the work when the Bell__A./,finished,rangB./,finshed,has rungC.had,finished,rangD.had,finished,had runghow long__you__the ditch?for 3 hoursA.have ,been diggin
so far the students about 5000 trees
A.have planted
B.had planted
C.planted
D.plant
hardly__he __the work when the Bell__
A./,finished,rang
B./,finshed,has rung
C.had,finished,rang
D.had,finished,had rung
how long__you__the ditch?
for 3 hours
A.have ,been digging
B.had,dug
C.are ,digging
D.dig,dig
so far the students about 5000 treesA.have plantedB.had plantedC.plantedD.planthardly__he __the work when the Bell__A./,finished,rangB./,finshed,has rungC.had,finished,rangD.had,finished,had runghow long__you__the ditch?for 3 hoursA.have ,been diggin
第一题选A, 因为前面的时间是so far ,也就是目前为止,所以应该用现在完成时
第二题选C, 当贝尔来的时候他几乎已经完成了工作,rang 是ring的过去时,rung是过去分词,这里应该用rang表示过去时,前面则用过去完成时,因为完成工作在贝尔打电话之前.
第三题选A, 这题的关键是回答,表示被问的人已经持续挖了3个小时的沟了,所以用现在完成进行时,表示此人已经持续挖了3个小时,现在还在挖.