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They want to know       do to help us.

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They want to know ______do to help us.

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They want to know ______do to help us.

A. what can they         B. what they can     C. how they can              D. how can they

They want to know ______do to help us.

A. what can they           B. what they can     C. how they can              D. how can they

They want to know _____ do to help us.

A. what can they B. what they can　　 C. how they can　 D. how can they