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

A．called in

B．calling in

C．call in

D．to call in

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参考答案

考查“but+动词不定式”结构。
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：have no choice but+带to不定式或have nothing to do but+不带to不定式。

1 She was so ________ in her job that she didn' t hear anybody knocking at the door.

A．attracted

B．absorbed

C．drawn

D．concentrated

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2 I haven' t decided which hotel________.

A．to stay

B．is to stay at

C．to stay at

D．is for staying

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3 It was not until midnight ________ they reached the campsite.

A．when

B．that

C．while

D．as

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