（2015•青岛）—How many times Carl to the Great Wall? —Only once.

题型：单选题题类：真题难易度：普通

—How many times Carl to the Great Wall?

—Only once.

A、 does ;go B、 did; go C、has; gone D、has; been

举一反三

②He {#blank#}3{#/blank#} not {#blank#}4{#/blank#} ( post)the letter an hour ago .

—Thanks! But I__________ it for several times.

—Not yet.

I {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#}in front of so many people {#blank#}4{#/blank#} .

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