A. have been

　　B. am

　　C. was

　　D. had been

　　8. Scientists say it may be five or six years ______ it is possible to test this medicine on human patients. (2017·雅礼中学月考一)

　　A. since

　　B. after

　　C. before

　　D. when

　　9. — Hey! Here is a message on my cell phone, telling me to send money to…

　　— Delete it! It's a trick. Many a person ______ by such tricks.

　　A. has been cheated

　　B. have been cheated

　　C. were cheated

　　D. was cheated 10. This water pollution accident involved fifteen factories, ______ it the most widespread accident in this area. (2017·师大附中月考三)

　　A. made

　　B. to make

　　C. making

　　D. having made

　　11. Never ______ a serious, angry or worried expression on your face, even when you are sad, because you never know who is falling in love with your smile.

　　A. show

　　B. showing

　　C. showed

　　D. have shown

　　12. Sorry, you can't take the typewriter away; I ______ it.

　　A. use

　　B. am using

　　C. used

　　D. have used

　　13. ______ about the robbers in the streets, the woman left her valuable things at home.

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