—I need a red pen now mom. —Oh Im busy now let your father one for you.A. to buyB. buy

问题补充：

—I need a red pen now, mom.

—Oh, Im busy now, let your father one for you.

A. to buy

B. buying

C. buys

D. buy

答案：

A. to buy

B. buying

C. buys

(答案→)D. buy

解析：句意：——妈妈，我现在需要一支红色的钢笔。——哦，我现在很忙，让你父亲给你买一支。let sb. do sth. 让某人做某事。故选D。

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