That was so serious a matter that I had no choice but（ ）the police.
A.正确答案Dcalled in
B.calling in
C.call in
D.to call in
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.
A.正确答案Dcalled in
B.calling in
C.call in
D.to call in
