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（请给出正确答案）
______, many problems of space flight could not be solved now.
A．If electronic computers would not have been invented
B．Had electronic computers not invented
C．Had electronic computers not been invented
D．If electronic computers were not invented
答案
更多“______, many problems of space flight could not be solved now.A．If electronic computers wo”相关的问题
第2题
What is the man's problem？
A．He is taking too many classes this semester.
B．He is failing one of his required courses.
C．He has a problem with his academic advisor.
D．He took classes with heavy reading assignments.
第3题
Many people leave their heating problem untreated because ______.
A. it is not serious
B. Crystal Ear is not yet available
C. it is not easy to have it treated
D. they don't want to look old
第4题
How many programs can the woman run at the same time without having a problem？
A．Three or more
B．Two or less
C．Three or less
D．Two or more
第5题
The word" inclusive" in paragraph 4 probably mean ______.
A．including many things
B．open-minded
C．considerate
D．relevant to a problem
第6题
According to the passage, Japan was facing a problem because many workers______.
A．do not want to leave work
B．fear their bosses
C．work inefficiently
D．take day off because of disease
第7题
What is the major problem of many elderly couples？
A．They have not enough money.
B．They have to leave home.
C．They feel useless and lonely.
D．They have no children or relatives.
第8题
The topic of the 4th paragraph is that ______.
A．one problem of loneliness is a person's social contacts
B．we depend on various people for different reasons
C．lonely people don’t have many social problems
D．lonely people don’t have many friends
第9题
Many people leave their hearing problem untreated because
A．it is not serious.
B．Crystal Ear is not yet available.
C．it is not easy to have it treated.
D．they don't want to look old.
