单选题 I'm sorry that I____________you had been there already.

A、 won't know
B、 didn't know
C、 don't know
D、 haven't known
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A、 tastes
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A、 will show, are
B、 are shown, is
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A、 have
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A、 have been
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单选题 When I was a child, my teacher told me that the earth ____________round.

A、 was
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C、 has been
D、 is

单选题 We can go when the ground____________.

A、 is drying
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A、 unless you will come
B、 unless you come
C、 until you will come
D、 until you shall come