Not believing their eyes the visitors on the spot the flying plane doing some most diff

问题补充：

Not believing their eyes, the visitors on the spot the flying plane, doing some most difficult and dangerous tricks in the sky.

A. glared at

B. stared at

C. glanced at

D. caught sight of

答案：

A. glared at

B. stared at

C. glanced at

D. caught sight of

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