26、You must explain       how they succeeded       the experiment.

       A.of us; to              B.a(chǎn)t us; at               C.to us; in              D.for us; in

26、C

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You must explain       how they succeeded       the experiment.

       A.of us; to              B.a(chǎn)t us; at               C.to us; in              D.for us; in

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