【題目】---The zookeeper was really annoyed with me.

--- How could he have been if you _______ stones at the animals?

A．didn’t throw

B．don’t throw

C．hadn’t thrown

D．haven’t thrown

【答案】C

【解析】此題考虛擬語氣。第一句動物管理員生氣是在過去，所以用石頭扔動物必然也是在過去，且在從句中，故應該用had done,此題答案為C。

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