第14题:[单选题]156 Not until he retired from teaching three years ago ________ having holiday abroad. A.he had considered B.had he considered C.he considered D.did he consider 参考答案:D
第17题:[单选题] The purpose of new technology is to make life easier, _____ it more difficult. A. not make B. not to make C. not making D. do not make 参考答案:B 并列不定式作表语,由句意可知此处为否定意义,故需用不定式的否定形式,即直接在不定式前加not。故选B。