60（）

By training the editor in your head, the speakers are advised 

• A、to get themselves trained by a good editor

• B、to discuss problems with their husbands or wives

• C、to express themselves in long but simple sentences

• D、to make sure each sentence has only one meaning

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