问题
选择题
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
答案
答案：D
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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
答案：D
