——Mike, can you tell us something about our new teacher?——Oh, sorry. I know nothing because I _ him before.

题型：单选题题类：模拟题难易度：普通

——Mike, can you tell us something about our new teacher?
——Oh, sorry. I know nothing because I _ him before.

A、saw B、didn't see C、have seen D、haven't seen

举一反三

— Yes, I {#blank#}3{#/blank#} (be) there twice.

Mom, {#blank#}1{#/blank#} you ever {#blank#}2{#/blank#} {#blank#}3{#/blank#} buying a piano for me?

—No, not yet.

—Yes, it's over there.

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