.The students look forward to for a picnic because they think they will have great fun.A.

问题补充：

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The students look forward to for a picnic because they think they will have great fun.

A. go, 不填

B. going, a

C. go, a

D. going, 不填

答案：

A. go, 不填

B. going, a

C. go, a

(答案→)D. going, 不填

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