The old couple married for 40 years and never once____ with each other.
| A．they had quarreled. | B．they have quarreled |
| C．have they quarreled | D．had they quarreled. |
The “Chinese Dream” is ______ dream to improve people’s well-being and ______ dream of harmony, peace and development
| A．the; a |
| B．a; a |
| C．a; the |
| D．the; the |
Carbon dioxide, which makes a _____ between us and the sun, prevents heat from getting out of the atmosphere easily, so the earth is becoming warmer.
| A．difference |
| B．comparison |
| C．connection |
| D．barrier |
______ your brother or you to blame for the broken TV set?
| A．Be |
| B．Are |
| C．Is |
| D．Were |
A large quantity of information, as well as some timely help, ______ since the organization was built.
| A．has offered |
| B．had been offered |
| C．has been offered |
| D．is offered |
More than one high official ______ by the police since the mayor was shot dead.
| A．has been questioned |
| B．have been questioned |
| C．was questioned |
| D．were questioned |