单选题
That was so serious a matter that l had no choice but ______ the police.
A、
called in
B、
calling in
C、
call in
D、
to call in
【正确答案】
D
【答案解析】
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。
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