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
—Call me at 5: 30 tomorrow morning． —Why that early? I _____ then．
#103153
A
will sleep
B
was sleeping
C
will be sleeping
D
have been sleeping
--It’s said that Mr. Wang ______ into a new apartment last Sunday.--Right. I went to his help.
#103522
A
moved
B
had moved
C
is moving
D
has moved
This year’s National Day ____ in a practical way, which is reported in People’s Daily.
#103596
A
is to be observed
B
observe
C
observes
D
is to observe
The girl told me that she ＿＿＿ beaten and she ＿＿＿telephone the police.
#101856
A
was; would
B
has been; will
C
had been; would
D
had been; will