________ global energy safety, all the countries have been called on to take joint efforts .
#97844
A
Having ensured
B
Ensuring
C
To ensure
D
To have ensured
推荐题目
She pretended _______ me when I passed by. 
#98790
A
not to see
B
not seeing
C
to not see
D
having not seen
 She was heard _______ at English song.
#96864
A
to sing
B
sang
C
sing
D
to be sung
The_______ moment we had been looking forward to_______ last week.
#94048
A
exciting;coming
B
exciting;came
C
excited;coming
D
excited;came
He told us ________ again.
#94036
A
to never do that
B
never to do that
C
never do that
D
never did that