1.columbuas..............America more then 400 years ago
a. discovered b.has discovered c.had covered d. he has gone
2.i..............inthe room new
a.am being b. was being c.have been being d.am
3.i.....................to New York three times this years
a.have been b.was c.were d.had been
4.my grandfather......................many years ago
a.had died b.has died c.died d. was dying
5.Ted and Amy.............for 24 years
a.have been married b.married c.were married d.has beeen
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Sinh Học lớp 12
