This river has changed its course many times. It _________ always located where it ________ at present.
A．isn’t; isB．isn’t; will beC．wasn’t; isD．wasn’t; has been
C
考查時(shí)態(tài)。句意：這條河改道了很多次。它不是一直都在現(xiàn)在這個(gè)位置的。因?yàn)槭沁^(guò)去不在，所以用wasn’t ，后者強(qiáng)調(diào)的是原先已經(jīng)坐落的地方，故用完成時(shí)has been。
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