This book is a collection of practical transistor circuits, ____ has been tested by the author in his own laboratory.
举一反三
- You can't use the machine because it ___ yet. A: has not tested B: has not been test C: has not been tested
- You can’t use the machine because it __________________ (not test) yet. A: has not been tested B: was tested C: has tested
- The author __________ the first chapter of his book ___________ by giving a brief account of the advances science has made since liberation.
- His book has been taken out of ______. A: circulation B: circuit C: circumference D: circumstance
- His collection of paintings has been put _____in<br/>many museums. A: on display B: on visit C: in display D: in visit