AIDS is said ______ the biggest health challenge to both men and women in that area over the past few years.
#98941
A
that it is
B
to be
C
that it has been
D
to have been
推荐题目
The flu is believed ________ by viruses that like to reproduce in the cell inside the human nose and throat.
#89170
A
causing
B
being caused
C
to be caused
D
to have caused
Much attention should be paid _______ the wild animals as many of them are dying out.
#96777
A
protect
B
to protect
C
protecting
D
to protecting
__________ with such great difficulty, Jack felt at a loss__________.
#97392
A
facing; what to say
B
Faced; what to say
C
Having faced; how to tell
D
Being faced ; how to speak
with the size of the whole earth , the biggest ocean does not seem big at all .
#93647
A
Compare
B
When comparing
C
Comparing
D
When compared
The organizers announced that the first ______ at the top shall receive a big prize.
#96832
A
arrived
B
arriving
C
to arrive
D
arrives