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

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

A.didn’t throwB.don’t throw

C.hadn’t thrownD.haven’t thrown

【答案】C

【解析】

試題解析:分析句子,可從后者說的前半句中的could have been 判斷此句是一個if引導(dǎo)的虛擬句。是對過去的虛擬,故從句用過去完成時,故選C。

句意:-- 那個動物園管理員真的對你很生氣。

-- 要不是你用石頭扔那些動物,他是不會這樣的。

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