With the help of high technology, more and more new substances ___in the past few years.
#101737
A
discovered
B
have discovered
C
had been discovered
D
have been discovered
推荐题目
I ____ to visit you later that day, but I had to phone and cancel.
#100505
A
come
B
came
C
am coming
D
was coming
-Sorry for keeping you waiting. -Never mind. I________ here only a few minutes.
#102837
A
came
B
come
C
was
D
have been
By the time you finish the book, you _______________ more about Chinese history.
#101573
A
will learn
B
have learnt
C
will have learnt
D
are learning
Mr. Smith ______ the grammar book meant for senior high school students and will almost finish it.
#99529
A
was writing
B
has written
C
has been writing
D
has been written
When she ______ back tomorrow, I’ll tell her all about the news.
#101692
A
will come
B
comes
C
had come
D
is coming