With the help of high technology, more and more substances _________ in the past years.
#101033
A
discovered
B
have discovered
C
had been discovered
D
have been discovered
推荐题目
---Does China have cultural relics?--- Yes, it is admitted that many cultural relics in the world, such as the Great Wall, the Potala Palace, the Magao Caves and so on, ______ China.
#102319
A
belongs to
B
are belonging to
C
belonged to
D
belong to
- I beg your pardon?- Your mind must have been __________ when I was speaking, wasn’t it?
#101532
A
wondering
B
wandering
C
walking
D
speaking
If it was fresh and ________, then the ship was close to land.
#103256
A
smelling strong
B
smelled strongly
C
smelled strong
D
smelling strongly
—You haven’t got the textbook for my chemistry yet.—I know, and we ________ to get it for the last five weeks.
#100488
A
will have been trying
B
have been trying
C
will be trying
D
had tried
—John, I didn’t ask for the dictionary. Why _______ on my desk?—Oh, I put it there just now in case you needed while writing your composition.
#100060
A
had it landed
B
does it land
C
will it land
D
has it landed