He was afraid that the branch might bend over and break, and he would be sent to the grou

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(答案→)A. crashing
B. throwing
C. rushing
D. dropping
解析：crash(to the ground)猛跌（到地上）。Crash n.
　　常指飞机等的“失事”，如：He was killed in an aircraft crash.(他在飞机失事中丧生。)本句中用falling不妥，fall指“落下，掉下”，本身并不强调落下的速度，而crash使“猛跌”，故本题用crashing最佳。