With the help of high technology, many new substances（物质）______in the past years.
#102927
A
discovered
B
have discovered
C
had been discovered
D
have been discovered
推荐题目
The doctor advised me to go on a diet because I _____ weight during the last two months.
#102170
A
put on
B
have put on
C
had put on
D
would put on
—Will you see me off at the airport at ten tomorrow morning?—Sorry, I ________ a lecture then.
#99470
A
will be giving
B
will give
C
give
D
have given
The basketball coach，as well as his team，________ interviewed shortly after the match for their outstanding performance.(2012·陕西)
#99566
A
were
B
was
C
is
D
are
He spent at least as much time reading as you online yesterday.
#103224
A
had to chat
B
did chatting
C
do chatting
D
had chatted
I listened carefully to his long boring speech, but could not what he was talking about.
#99882
A
pick out
B
make out
C
bring out
D
give out