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

解析句意：那件事如此严重，除了请警察，我别无选择。这种结构一般有两种模式：haveno choice but+带to不定式或have nothing to dobut+不带to不定式。

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