—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 |
相关试题
34. He had no sooner arrived there ________ pestering his doctor.
| A．and then he began | B．when he began | C．to begin | D．than he began |
33. While s
hopping, people sometimes can't help _______ into buying something they don't really need.
| A．to persuade | B．persuading | C．being persuaded | D．be persuaded |
32. With no one to ______ in such a frightening situation, she felt very helpless.
| A．turn on | B．turn off | C．turn around | D．turn to |
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