That was so serious a matter that I had no choice but ______ the police.

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问题 That was so serious a matter that I had no choice but ______ the police.

选项 A、called in
B、calling in
C、call in
D、to call in

答案D

解析 分析句子结构可知have no choice but to do sth.是固定搭配,意为“不得不做,必须做”,其他三个选项均不能用于此固定结构中,因此,选项D正确。
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