_____ the days went on, my memories seemed to get worse.
| A．With | B．Since | C．As | D．While |
Over the past decades, sea ice in the Arctic as a result of global warming.
| A．had decreased | B．decreased | C．has been decreasing | D．is decreasing |
—You speak very good French!
—Thanks. I __________ French in Sichuan University for four years.
| A．studied | B．study | C．was studying | D．had studied |
—Why don’t we choose that road to save time?
—The bridge to it __________.
| A．has repaired | B．is repaired |
| C．is being repaired | D．will be repaired |
The number of foreign students attending Chinese universities ________ rising steadily since1990.
| A．is | B．are | C．has been | D．have been |
-Why does the Lake smell terrible?
-Because large quantities of water .
| A．have polluted | B．is being polluted | C．has been polluted | D．have been polluted |