How long ________ they ________ (dig) the ditch?
have … been digging
暫無解析
He________methathedecidedtoleaveonMonday.
Wewerebusy________(get)thingsreadyforthetrialproductionwhenhephonedus.
Night________(fall),wehurriedhome.
Somemoleculesarelargeenough________(see)undertheelectronicmicroscope.
Hardlyhadhefinishedhisspeech________theaudiencestartedcheering.
