20、Having waited for the scientist for nearly an hour, they      that he could not arrive on time.

A．have informed        B．informed          C．were informed         D．a(chǎn)re informed

20、C

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Having waited for the scientist for nearly an hour, they      that he could not arrive on time.

A．have informed        B．informed          C．were informed         D．a(chǎn)re informed

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