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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

It is 4:30 p.m. Ben and Leon _______ their work, so they are playing chess now.

— It's the second time I have come to Xiamen. It __________ a lot.

—Yes, it's more and more beautiful.

— Are you going to further your studies after graduation?

— Well, I yet. I might make some other choices.

I'm waiting for my parents at the bus stop. But neither of them {#blank#}1{#/blank#} {#blank#}2{#/blank#}yet. (arrive)

So far, the book{#blank#}1{#/blank#}(sell) out in stores across the country.

She has {#blank#}1{#/blank#}(摆放) the table before the guests get to her home.

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