she thought she?to nanjing at least three times.a:was b:had been c:would be ;d:had been

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shethoughtshe?tonanjingatleastthreetimes.a:wasb:hadbeenc:wouldbe;d:hadbeenshethoughtshe?tonanjingatl

she thought she?to nanjing at least three times.a:was b:had been c:would be ;d:had been
she thought she?to nanjing at least three times.
a:was b:had been c:would be ;d:had been

she thought she?to nanjing at least three times.a:was b:had been c:would be ;d:had been
had been这是个宾语从句,主句一般过去时,从句的动作发生在主句的动作之前,即过去的过去.所以从句要用过去完成时

had been