With the help of high technology, more and more new substances ___in the past few years.
#101737
A
discovered
B
have discovered
C
had been discovered
D
have been discovered
推荐题目
— Where do these books ______? — Put them back ______ they were.
#99253
A
go; where
B
lay; where
C
lie; to where
D
place; to which
—I wonder if your wife will go to the ball. —If your wife does, so _____ mine.
#104176
A
is
B
do
C
does
D
will
Before us lies the biggest room, _____ with things like guns, dolls and old clothes.
#101699
A
filling
B
filled
C
being filled
D
having been filled
Last week I took the Civil Service Admission Examination, for which I _____ for nearly three months．
#102168
A
had prepared
B
would prepare
C
was preparing
D
have been preparing
—Are you still busy?—Yes，I________my work，and it won't take long.
#99197
A
just finish
B
am just finishing
C
have just finished
D
am just going to finish