Great as Newton was, many of his ideas_____today and are being modified by the work of scientists of our time.
#104460
A
are to challenge
B
have challenged
C
are challenging
D
have been challenged
推荐题目
A group of children ______ hide and seek in the garden.
#103823
A
is playing
B
are playing
C
has been playing
D
was playing
My sister ________ for long when she fell seriously ill.
#100024
A
didn’t marry
B
has been married
C
hadn’t been married
D
wasn’t married
Professor Smith, along with his assistants, _________on the project day and night to meet the deadline.
#102351
A
work
B
working
C
is working
D
are working
Mr. Lee, who _______ as a carpenter for over 10 years, is now a very famous statesman in this country.
#102270
A
has worked
B
had worked
C
worked
D
works