—Jack, I have________ working out the math problem.—Don't worry. Let me help you.

题型：单选题题类：常考题难易度：普通

牛津译林版九年级下册Unit3Robots单元测试

—Jack, I have________ working out the math problem.

—Don't worry. Let me help you.

A、fun B、trouble C、experience D、interest

举一反三

— OK, let's have a look. There may be something strange.

—No, I lost touch with him two years ago.

—Yes, but he has no time to reply.

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