The news____(be) very exciting.
A. are
B. was
C. is
D. doing
查看答案
To learn one or two foreign languages____ (be) very important nowadays.
A. are
B. were
C. was
D. is
The last and most difficult lesson____ (be) Lesson 14.
A. are
B. done
C. is
D. were
I, who .____ your friend, will try my best to help you.
A. are
B. is
C. was
D. am
The scientist and engineer ____ (have) invented a new machine.
A. are
B. was
C. has
D. were