题型：单选题题类：常考题难易度：困难

—— ______you _____ out the problem, Sam?
——Not yet, but I'm going to.

A、Did, work B、Are, working C、Have, worked D、Will , work

举一反三

— Of course, I _________ it twice!

The government has {#blank#}1{#/blank#} {#blank#}2{#/blank#} its air force.

— No, he to the dining hall.

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