——Must I work out the problem right now? ——Yes, you _______. It's very serious.

题型：单选题题类：模拟题难易度：普通

——Must I work out the problem right now?
——Yes, you _______. It's very serious.

A、can B、must C、may D、should

举一反三

一 Please tell me if you need my help.

—Sorry, I_______. I take care of my little sister because my mother is out.

—Of course, I'll fetch them for you．

{#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} me the way to the park, please?

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