He showed great interest in my field of work.He asked me ( )fresh developments.A to keep him informingB to keep him informedC to be kept informed of D to keep him informed of为什么选D?

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He showed great interest in my field of work.He asked me ( )fresh developments.A to keep him informingB to keep him informedC to be kept informed of D to keep him informed of为什么选D?

He showed great interest in my field of work.He asked me ( )fresh developments.A to keep him informingB to keep him informedC to be kept informed of D to keep him informed of为什么选D?
He showed great interest in my field of work.He asked me ( )fresh developments.
A to keep him informing
B to keep him informed
C to be kept informed of
D to keep him informed of
为什么选D?

He showed great interest in my field of work.He asked me ( )fresh developments.A to keep him informingB to keep him informedC to be kept informed of D to keep him informed of为什么选D?
ask sb. to do
keep sb. informed of sth.使某人知道某事