The flu is believed ______ by viruses that like to reproduce in the cells inside the human nose and throat.
#90948
A
to be caused
B
to have caused
C
being caused
D
causing
推荐题目
_____________ many times, the problems were settled at last.
#95310
A
Having discussed
B
Being discussed
C
To be discussed
D
Discussed
—He didn't feel a bit nervous when ________.—No. He'd had a lot of time ________ for it after all.
#95782
A
interviewing; to prepare
B
interviewed; to prepare
C
interviewing; preparing
D
being interviewed; preparing
in charge of the shopping center has upset him for quite some time.
#98579
A
Left
B
Being left
C
Having left
D
To leave
The secretary worked late into the night, ______a long speech for the president.
#98365
A
to prepare
B
preparing
C
prepared
D
was preparing
A person , when_________，can often do what is normally beyond his ability.
#90324
A
challenged
B
challenges
C
challenging
D
to challenge