— Why does the river smell terrible?
— Because large quantities of polluted water _______ into it.
| A．have poured | B．is being poured | C．has been poured | D．have been poured |
Xi’an was the last city ______ he visited when he came to China.
| A．where | B．which | C．that | D．in which |
The music ______ she is dancing sounds beautiful.
| A．by which | B．to which | C．with which | D．at which |
______ time ______, what the scientist said finally proved to be true.
| A．With; went by | B．With; going by |
| C．As; goes by | D．As; going by |
Mary never does any reading in the evening, __________.
| A．so does John | B．John does too |
| C．John doesn’t too | D．nor does John |