Question

The children _______ a PE class on the playground when it suddenly began to rain.

A．have

B．are having

C．had

D．were having

Answer 1

D

在天气突然下雨的时候，孩子们上体育课应该是正在上，用进行时，本题从句为过去，故主句用过去进行时，故本题选D。