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D. she did sing 48. _____ the people have bee masters of their own country that science can really serve the people. A. Only then B. It is only then C. Only when D. It is only when49. Not only _______ difficult to understand, but it was too long. A. it was B. it made C. did it make D. was it50. Only when the rain stopped _____ again. A. the match started B. does the match start C. did the match start D. the match had started51. ______ had I finished my translation when the class was over. A. Never B. No sooner C. Hardly D. How52. In _______ and the lesson began. A. he came B. came he C. he es D. es he53. On the wall ______ two large pictures. A. hangs B. hang C. hanged D. are hanging54. Such ______ the results of the experiments. A. is B. was C. are D. as be 55. —They have done a good job. —________. A. So they have done B. So they have C. So have they D. So is it56. ______ he realized it was too late to return home. A. No sooner it grew dark than B. Hardly did it grow dark when C. It was not until dark that D. It was until dark that 57. _____, Mother will wait for him to have dinner together. A. However late is he B. However he is late C. However is he late D. However late he is58. _____ hot is the sun that we cannot go out at present.A. Very B. Too C. So D. Such110 CADCC BBDBB 1120 ADCCA BDDBA2130 ADCAB DDBDC 3140 DDAAC AABAB4150 BBABB BCDDC 5158 CABCB CDC7