While watching television，____．
#92243
A
the doorbell rang
B
the doorbell rings
C
we heard the doorbell ring
D
we heard the doorbell rings
推荐题目
Advertisements _______ these facts have been printed in newspapers and magazines but have not helped much.
#96120
A
based on
B
base on
C
to base on
D
basing on
______ abroad for more than two years, he returned to his hometown.
#89414
A
Studied
B
Studying
C
Having studied
D
To study
China’s first aircraft carrier, ____ as long as 304 metres, was handed over to the People’s Liberation Army navy in 2012.
#90866
A
measures
B
measured
C
to measure
D
measuring
After driving all night we got to Amy’s place，_____ that she was away.
#98755
A
only to discover
B
only discovering
C
only discovered
D
only having discovered
He will keep ________ new ideas so he can help farmers around China.
#96464
A
trying on
B
trying out
C
trying
D
both B and C