So far, several cases of a disease,        as bird flu, are reported to have been found in the country.
#96545
A
knowing
B
to be known
C
having known
D
known
推荐题目
To learn to speak English well,_____.
#97514
A
much practice is needed
B
one needs much practice
C
much practice is needed by one
D
one is needed much practice
The students expected ____ more reviewing classes before the exam. 
#95664
A
there to be
B
there are
C
there being
D
there to have