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單項(xiàng)選擇題

The scientists are（）a series of experiments to learn more about how the body adapts to weightlessness.

A.defining
B.having
C.carrying
D.doing

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The red flower goes from one to（）in the class.

A.the other
B.others
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單項(xiàng)選擇題

The rain was（）make our picnic impossible.

A.hard enough
B.hard so to
C.so hard as to
D.so hard to

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