—Have you ever visited the Water Cube? —Yes. When I served as a volunteer in Beijing, I      it twice.
#102056
A
have visited
B
visited
C
had visited
D
had been visiting
推荐题目
I was just going to cut my rose bushes but someone _______ it. Was it you?
#101219
A
has done
B
had done
C
would do
D
was doing
His second book nearly comes to an end and it’s said that it ______ in two months.
#100727
A
will publish
B
will be published
C
has published
D
has been published
My friend, Tom, left New York in 1976 and       since then.
#103438
A
hadn’t been heard of
B
hasn’t been heard of
C
hasn’t heard of
D
hadn’t heard of