____has been a topic of continual geological research.
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____has been a topic of continual geological research.
A Did the continents originate
B How did the continents originate
C.Have the continents originated
D.How the continents originated
A Did the continents originate
B How did the continents originate
C.Have the continents originated
D.How the continents originated
B 大陆的起源在那里一直是我们地质研究的课题.
____has she been a nurse?____she graduated.
a topic of 还是 the topic of
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tom ____has a bike.
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a great deal of research has been done into the possible cau
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In our class ,____has a dictionary.A.all of us B.each of us
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