That was so serious a matter that I had no choice but the police.A. called in B. calling

发布时间：2020-08-15 03:04:17

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

网友回答

A. called in
B. calling in
C. call in
(答案→)D. to call in
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