They____never_____（be）to that farm before.办号就为了送分,如果有会的请告诉我.

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They____never_____（be）to that farm before.办号就为了送分,如果有会的请告诉我.
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They____never_____（be）to that farm before.办号就为了送分,如果有会的请告诉我.
They____never_____（be）to that farm before.
办号就为了送分,如果有会的请告诉我.

They____never_____（be）to that farm before.办号就为了送分,如果有会的请告诉我.
They (have) never (been) to that farm before.

我怎么觉得应该是had been呢。。

They__have__never_been_（be）to that farm before.

They____never_____（be）to that farm before.办号就为了送分,如果有会的请告诉我. b b, b b (b, B b b B b. b b b b b 求下列行列式 a b b b b a b b b b a b b b b a 计算a+b/b-a-b/b