Every possible means _______to prevent the air pollution, but the sky is still not clear.
| A．are being used | B．have been used | C．has been used | D．had been used |
相关试题
—Which of the two computer games did you prefer?—Actually I didn’t like ______.
| A．both of them | B．either of them | C．none of them | D．neither of them |
—I’d like some more cheese.—Sorry, there’s ______ left
| A．some | B．none | C．a little | D．few |
Do you want tea or coffee? —______. I really don't mind.
| A．None | B．Neither | C．Either | D．All |
The English spoken in the United States is only slightly different from ______ spoken in England.
| A．which | B．what | C．that | D．the one |
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