―Twenty dollars please! ― How terrible! I to bring my wallet with me.A. was forgettingB.

问题补充：

―Twenty dollars, please!

― How terrible! I to bring my wallet with me.

A. was forgetting

B. forgot

C. had forgotten

D. am forgetting

答案：

A. was forgetting

(答案→)B. forgot

C. had forgotten

D. am forgetting

解析：用过去时态表示动作forget发生在过去。