He ___ in the factory for three years before he joined the Army.
A. has worked
B. works
C. had worked
D. will work
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His uncle has already posted the photos to him. (改为否定句)His uncle ______ not posted the photos to him ______.
I began to teach in New Oriental School in 2008. It is 2018 now. So far I ______(teach) here for 10 years. By 2017, I ______(teach) for 9 years.
He has already gone home.He ___1____ ____2______ home ____3________. (否定句)______4______ he _____5_____ home ___6___? (一般疑问句)
3. He has been there twice.he been there? (就划线提问)