34. －Are you sure you have to? It’s been very late.－I don’t know I can do it if not now.A

问题补充：

34. －Are you sure you have to? It’s been very late.

－I don’t know I can do it if not now.

A. how

B. what

C. when

D. That

答案：

A. how

B. what

(答案→)C. when

D. That

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