—What worried him so much?—His hair’sgrey.A. goingB. becomingC. turningD. staying

问题补充：

—What worried him so much?

—His hair’sgrey.

A. going

B. becoming

C. turning

D. staying

答案：

(答案→)A. going

B. becoming

C. turning

D. staying

解析：考查系动词用法。Go表示由好变坏；如go bad变质；本句中的头发变的灰白，是从好的方面向不好的方面转变的。故A正确。