6.1练习（一）大学课件.pdf

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n.+v.

Uptonow,oursociety______withlimited

livingspaceandashortageofnatural

resources.

A.hasbeenchallenged

P

B.isbeingchallenged

C.ischallenging

D.haschallenged

BeforemovingtoAustralia,theBrowns______

theircarsandhouseintheUSA.

A.havesold

B.sold

P

C.wereselling

D.sell

IfeltverytiredwhenIgothome,andI____

straighttobed.

A.go

B.went

P

C.hadgone

D.havegone

Teenagers______theirhealthbecausetheyplay

computergamestoomuch.

A.havedamaged

B.aredamaging

P

C.damaged

D.willdamage

Jack______inthelabwhenthepowercutoccurred.

A.works

B.hasworked

C.wasworking

P

D.wouldwork

—Excuseme,whichmovieareyouwaitingfor?

—ThenewStarWars.We______hereformore

thantwohours.

A.waitedB.havebeenwaiting

P

C.waitD.wouldbewaiting

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