问题描述：
past perfect vs.simple past.Choose the correct verb form.
Sam ___________yesterday.
a.left b.has left c.had left d.leaving
Sam____________when you__________.
a.had already left,called b.left already,called c.has left,call d.leaving,calling.
Last night I saw an old friend.I____________her in years.
a.not seeing b.haven't seen c.hadn't seen d.didn't see
Last month,I visited New York alone,Before that,I___________by myself.
a.never traveled b.have never traveled c.never travel d.had never traveled
By the time the movie finished,it_______________raining.
a.had stopped b.have stopped c.stopped d.stop
Sam ___________yesterday.
a.left b.has left c.had left d.leaving
Sam____________when you__________.
a.had already left,called b.left already,called c.has left,call d.leaving,calling.
Last night I saw an old friend.I____________her in years.
a.not seeing b.haven't seen c.hadn't seen d.didn't see
Last month,I visited New York alone,Before that,I___________by myself.
a.never traveled b.have never traveled c.never travel d.had never traveled
By the time the movie finished,it_______________raining.
a.had stopped b.have stopped c.stopped d.stop
问题解答：
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