____ private cars are bringing us convenience, they may also cause more traffic accidents and pollution.
| A．While | B．As | C．If | D．Since |
相关试题
By the time Jack r
eturned home from England, his son. from college.
| A．graduated | B．has graduated |
| C．had been | D．had graduated |
When the news came the war broke out, he decided, to serve in the army.
| A．since | B．which | C．that | D．because |
Bring the flowers into a warm roomthey'll soon open.
| A． | or | B． | and | C． | but | D． | for |
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