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447.Mr.Green once _______ English at Cambridge University for 5 years and now is a speaker.
No wonder he ______ perfect English.
A.had taught；spoke
B.taught；speaks
C.is teaching；has spoken
D.has been teaching；will speak
448.Why did you leave the water running in the sink?
Heavens!I guess I _____ to turn it off.
A.forgot
B.have forgotten
C.will forget
D.had forgotten
