This river has changed its course many times. It ___ always located where it ___ at present.
A.isn’t; is B.isn’t; will be C.wasn’t; is D.wasn’t; has been正确答案C
This river has changed its course many times. It ___ always located where it ___ at present.
A.isn’t; is B.isn’t; will be C.wasn’t; is D.wasn’t; has been正确答案C