We must answer the telephone by the first ring.
举一反三
- While watching television, （） A: the telephone rang B: we heard the telephone ring C: we heard the telephone rang D: the telephone was rung
- 中国大学MOOC: She was ________ by the telephone ring.
- _____________, we must first have a sound body.
- Before using "this" pointer, we must first declare it.
- The telephone (ring) __________ for three minutes before it was answered.