美国f105雷公战斗机:______,many problems of space flight couldn’t have been solved
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A. If electronic computers were not invented
B. If electronic computers are not invented
C. Had electronic computers not been invented
D. Had electronic computers been invented
B. If electronic computers are not invented
C. Had electronic computers not been invented
D. Had electronic computers been invented
C
=if electronic computers had not been invented
虚拟时
C
省略if的虚拟时态
______,many problems of space flight couldn’t have been solved
______,many problems of space flight couldn’t have been solved
______,many problems of space flight couldn’t have been solved
怎样翻译 many problems are routine or anticipated
they can help peopleto w_____out many problems they can't do easily.
English problems
english problems
ENGLISH PROBLEMS
English Problems
some problems