题目内容

______ has been a topic of continual geological research.(1.0)

A. Did the continents originate
B. How did the continents originate
C. Have the continents originated
D. How the continents originated

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-Doesn’t Helen live on this street? -No. This is ______ Leon lives.(1.0)

A. which
B. where
C. that
D. what

I doubt ______.(1.0)

A. whether he can come
B. if he can come or not
C. while he will be here
D. what will he do

There is no doubt ______ he will come soon.(1.0)

A. which
B. if
C. whether
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The parallax measurement is used in survey studies to tell how far away ______.(1.0)

A. is an object distant
B. distant is an object
C. an object is distant
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