— Have you ever visited the Opera House?—Yes.When I was in Sydney, I ______ it twice.
#102371
A
have visited
B
had visited
C
visited
D
would visit
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I haven' t seen Mary these past few days. I m afraid she ____ herself for some time.
#104846
A
isn't feeling
B
hasn' t been feeling
C
hadn't been feeling
D
wasn't feeling
How can I ever concentrate if you ________ continually ________ me with silly questions? 
#104794
A
have…interrupted
B
had interrupted
C
are…interrupting
D
were…interrupting
The retired teacher is said to have returned from the USA, where he ______ by some of his old students.
#99233
A
would be visited
B
visited
C
had been visited
D
have been visited