There is no doubt________man will continue to explore the vast universe in the f
题型:山西省同步题难度:来源:
There is no doubt________man will continue to explore the vast universe in the future, but the rate at which we approach depends on the development of technology.
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A. whether B. what C. when D. that
答案
D
举一反三
A good idea came to her________she could live with her best friend in that city during the holiday.