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
–Ann is in hospital. ---Oh, really? I _____ know ,I ____ go and visit her.
#103116
A
didn’t ;am going to
B
don’t ;would
C
don’t; will
D
didn’t ;will
I used to drink a lot of tea but these days I ______ coffee.
#104266
A
prefer
B
preferred
C
had preferred
D
am preferring
My parents have promised to come to see me before I _____ for Africa.
#100358
A
have left
B
leave
C
left
D
will leave
Having a glass of water first thing in the morning helps rid your body of poisonous substances that ________ overnight.
#99243
A
were stored
B
had been stored
C
are being stored
D
have been stored