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
【正确答案】：D
【题目解析】：
have no choice but to do sth.除了...我别无选择。选D。句意：这是如此严重的一件事，以致于我不得不叫警察。
That was so serious a matter that I had no choice but（ ）the police.
That was so serious a matter that I had no choice but（ ）the police.
called in
calling in
call in
to call in
have no choice but to do sth.除了...我别无选择。选D。句意：这是如此严重的一件事，以致于我不得不叫警察。