Theambulancewasjustarriving,foraworker,who

問題詳情：

The ambulance was just arriving, for a worker, who ______ the window on the second floor, fell off the window.

A．had been repairing                                     B．was repairing

C．has been repairing                                      D．would be repairing

【回答】

A

【解析】

考查時態。根據句意可知，工人修理窗户發生在掉落下來之前，即過去的過去，過去完成時

知識點：過去完成進行時

題型：選擇題