问题描述：
Millions of people watched the Chang'e-l satellite flying around the moon on TV,＿＿how difficult
and dangerous an advanture it is.
A.aware of B.aware that C.awaring D.and awared E.awaring of
请说明原因
and dangerous an advanture it is.
A.aware of B.aware that C.awaring D.and awared E.awaring of
请说明原因
问题解答：
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