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
There are still many people suffering a lot，and we are to do something to________poverty.
#100877
A
keep out
B
wipe out
C
give out
D
run out
The United States _______one of the lowest smoking rates －25.5 percent of the population.
#103540
A
is
B
have
C
has
D
are
—Why weren’t you at the meeting?—I ________ for a long-distance call from my aunt in America.
#104740
A
waited
B
was waiting
C
had been waiting
D
had waited
A: Hi , Randall,Come on in .B: Uh, yeah, I by to see if you for a roommate to share your house.
#103994
A
stopped; were still looking
B
will stop ;are still looking
C
have stopped ; were still looking
D
stop ; will have looked
With the rapid development of medical science, we ___ more new drugs used in the treatment of cancer．
#100437
A
see
B
had seen
C
will be seeing
D
would see