Although there were only five athletes ____ in the race, it was a rather exciting one.
#102442
A
competing
B
having been competed
C
to compete
D
to be competed
推荐题目
Residents ________ not to go out alone or to take part in any groups during the period of recent terrorist activities. 
#104240
A
were always being warned
B
are always warning
C
always warned
D
had always been warned
 ---Do you have any news about Bob?  ---Yeah. We ______ each other quite a lot recently.
#99888
A
have been seeing
B
had been seeing
C
see
D
have seen
Look! The houses _________.
#101961
A
is being built
B
are building
C
being built
D
are being built