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
－Oh, it’s Julia, I her!－She’s just make her hair cut and she is a new dress.
#101550
A
don’t recognize; having on
B
didn’t recognize; wearing
C
haven’t know; putting on
D
didn’t know; dressing
— Where do these books ______? — Put them back ______ they were.
#99253
A
go; where
B
lay; where
C
lie; to where
D
place; to which
Many tall buildings _______ in Shanghai in the past few years.
#101297
A
has been built
B
have built
C
were built
D
have been built
--- Jack, what about the lecture? --- It is the most inspiring lecture that I _________ since I came to this university.
#99803
A
attended
B
have attended
C
am attending
D
had attended