.He suddenly saw what looked like a snake in the darkness. For an instant his heart seemed to stop .
A. to beat
B. beating
C. beaten
D. being beaten
网友回答
A. to beat
(答案→)B. beating
C. beaten
D. being beaten
解析：本题考查动词用法。Stop doing停止做，stop to do停下来做。句意：他突然在黑暗中看到像蛇的东西，瞬间他的心脏好像停止跳动了。