By the time he was twelve he ______ a chemistry lab of his own.
#104127
A
built
B
has built
C
had built
D
was building
推荐题目
– Do you know the West Lake in Hangzhou? – Yes, this is the third time that I ____ this beautiful city.
#103081
A
visit
B
visited
C
have visited
D
had visited
Great changes _____ in this city over the past five years.
#100896
A
tookplace
B
havetakenplace
C
weretakenplace
D
havebeentakenplace
—That must have been a long trip.—Yeah, it us a whole week to get there.
#102656
A
takes
B
has taken
C
took
D
was taking
I used to drink a lot of tea but these days I _____ coffee.
#100930
A
preferred
B
prefer
C
have preferred
D
am preferring