—Mrs White why are you standing here?—I’m waiting for my son. He back from school.A. did

问题补充：

—Mrs White, why are you standing here?

—I’m waiting for my son. He back from school.

A. didn’t come

B. won’t come

C. hasn’t come

D. hadn’t come

答案：

A. didn’t come

B. won’t come

(答案→)C. hasn’t come

D. hadn’t come

解析：句意：怀特夫人你为什么站在这里？我正在等我的儿子，他还没有从学校回来。动作发生在过去但强调对现在的影响用现在完成时。该句没有回来对现在的影响是在等他回来，故用现在完成时态，故选C