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
Hurry up! The shop ＿＿ in five minutes.
#101557
A
closes
B
is closing
C
has closed
D
is about to close
Flight 3010______,I must be off now or I’ll be late.
#103587
A
to announce
B
is announced
C
is being announced
D
announced
— Julia, what were you doing when Anna called you?—I my housework and to take a bath.
#101677
A
had finished; started
B
have finished; to start
C
have finished; have started
D
had finished; was starting
—Good morning，Doctor Brown’s office.—Hello, this is Tom Smith. Could you please tell Doctor Brown I ? My car start.
#104869
A
was delayed, doesn’t
B
will be delayed, won’t
C
am delayed, didn’t
D
would delay, mustn’t
Jane was disappointed that most of the guests when she at the party.
#104681
A
left; had arrived
B
left; arrived
C
had left; had arrived
D
had left; arrived