the bus he was waiting for over half an hour arrived only a minute agoa arrive b arriving c arrived d had arrived为什么选c,

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the bus he was waiting for over half an hour arrived only a minute agoa arrive b arriving c arrived d had arrived为什么选c,

the bus he was waiting for over half an hour arrived only a minute agoa arrive b arriving c arrived d had arrived为什么选c,
the bus he was waiting for over half an hour arrived only a minute ago
a arrive b arriving c arrived d had arrived
为什么选c,

the bus he was waiting for over half an hour arrived only a minute agoa arrive b arriving c arrived d had arrived为什么选c,
only a minute ago 这是个一般过去时标志性状语

the bus that he was waiting for