第1个回答 2010-12-18
in order to ensure that he (should) attend the meeting
第2个回答 2010-12-18
to ensure him attending the meeting
第3个回答 2010-12-18
To Make sure that he attends the meeting...
To Make sure that he attends the conference...
assuring that he attends the conference...
第4个回答 2010-12-18
to ensure that he attends the conference
无语病，非机器翻译 =D
第5个回答 2010-12-20
不好意思，今天才看到您的求助。上面的解答已经很好了。还可以是：to ensure he will attend the meeting