填had to go 是正确的。 解这个题要特别注意问句和答语的时态一致性。 问”今天上午你去哪里了？我打不通你电话“ 答”我去了趟图书馆“ 很明显去图书馆是发生过的事实。而tried to go to the library表示了一种想去图书馆的意图，暗示没有去；should go表示应该去，也表示未发生；must go必须去，但是也未发生，这三个选项都不符合题意。故舍弃。
where were you this morning?Itried to call you.后面是回答了I(hadto
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where were you this morning?Itried to call you.后面是回答了I(hadto
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