问题
选择题
There was so serious a matter that I had no choice but _________ the police.
A．called in
B．calling on
C．call for
D．to call in
答案
答案：D
考查短语：别无选择做某事have no choice but to do,句意：有如此严重的事以至于我别无选择给警察打电话。所以选D。
搜题请搜索小程序“爱下问搜题”