58. They _____ the lecture, but upon learning that we would discuss something irrelevant to their field of study, they gave it up.

　　A) were going to attend

　　B) were to attend

　　C) had attended

　　D) would have attended

　　59. Without electronic computers, much of today's advanced technology _____.

　　A) have not been achieved

　　B) would not achieve

　　C) would not have been achieved

　　D) would not be achieved

　　60. _____ knows the truths about it will tell you.

　　A) Who that

　　B) That

　　C) Whoever

　　D) That who

　　61. It was not yet eleven o'clock _____ a boat crossed the river with a single passenger who had obtained his transportation at that unusual hour by promising an extra fare.

　　A) what

　　B) when

　　C) that

　　D) which

　　62. Women workers wear hats _____ their hair gets caught in the machinery.

　　A) if

　　B) in case

　　C) unless

　　D) because

　　63. No sooner had they come back _____ they went to sleep.

　　A) when

　　B) then

　　C) until

　　D) than