Since he was not an expert, he picked the horses ____ random.
举一反三
- He is a well-known expert in ________.
- He was ________ as an expert in this field.
- It ____________(know) that he is an expert in linguistics.
- He picked up the pen in the factory. 改为： ?
- He ____ the phone expecting to hear the chairman's gruff voice. A: picked up B: picked at C: picked on D: picked out