Millions of people watched the Chang'e-l satellite flying around the moon on TV,__how difficultand dangerous an advanture it is.A.aware of B.aware that C.awaring D.and awared E.awaring of请

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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

B
== Millions of people watched the Chang'e-l satellite flying around the moon on TV.They were (well) aware (of) how difficult a time the Chinese scientists had getting it into operation.

A

B