174. All these means _____ to prevent the air pollution, but the sky is still not clear.
A. is used B. are used C. has been used D. have been used
173. Every possible means _____ to prevent the air pollution, but the sky is still not clear. (2000上海春)
172. Along with the letter was his promise about _____ we were all eager to know.
A. which B. that C. what D. whether
171. Along with the letter was his promise _____ he would visit me this coming Christmas. (2004上海春)
170. The other day, my brother drove his car down the street at the highest speed ______ I have never seen.
A. as B. which C. what D. that
169. The other day, my brother drove his car down the street at _____ I thought was a dangerous speed. (2004上海春)
168. It is pretty well understood _____ the earth goes around the sun.
A. that B. when C. what D. how
167. It is pretty well understood _____ controls the flow of carbon dioxide in and out the atmosphere today. (2003上海)
166. _____ more than 90% of the students have been admitted to key universities is _____ the school takes pride in.
A. What; because B. What; that C. That; what D. That; because
165. _____ made the school proud was _____ more than 90% of the students had been admitted to key universities. (2003上海春)