How long ________ they ________ (dig) the ditch?
have … been digging
暂无解析
He________methathedecidedtoleaveonMonday.
Ifound________toanswerallthequestionswithinthetimegiven.
Ihavebeenstudyinghereforfouryears,bynextsummerI________.
Wooddoesnotconductelectricity;________.
Themorewelookedatthepicture,________.
