They want to know do to help us.A. what can theyB. how they canC. what they canD. how can

问题补充：

They want to know do to help us.

A. what can they

B. how they can

C. what they can

D. how can they

答案：

A. what can they

B. how they can

(答案→)C. what they can

D. how can they

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