单项选择题

The frame needs to be strong enough to support the engine.（）

A. structure
B. bottom
C. surface
D. top

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单项选择题

It seems incredible that he had been there a week already.（）

A. right
B. obvious
C. unclear
D. unbelievable

单项选择题

We found shelter from the rain under the tree.（）

A. defense
B. protection
C. standing
D. room

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