He is sure____his success.A.at B.of C.in D.on

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He is sure____his success.A.at B.of C.in D.on

He is sure____his success.A.at B.of C.in D.on
He is sure____his success.A.at B.of C.in D.on

He is sure____his success.A.at B.of C.in D.on
B of
be sure of sth .对---确信.
他确信他可以成功.

B.of

B,be sure of sth ,对什么确信