17．—Is there any better way to help my son get rid of the habit of playing computer games?
—To tell you the truth, it’s very hard. But we_______on this problem to improve the situation.
| A．were working | B．had worked | C．are working | D．had been working |
相关试题
Between the two roads_________ a TV tower called“Skyscraper Tower”.
| A．stands | B．standing | C．which stands | D．stand |
______
__________ surprised us very much that Tom should have left without a word.
| A．He | B．It | C．This | D．That |
It is reported that two schools, _________are being built in my hometown, will open next year.
| A．they both | B．which both | C．both of them | D．both of which |
He tried his best to solve the problem, _______difficult it was.
| A．however | B．no matter | C．whatever | D．although |
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