1. You should have put the milk in the ice box; I expect it _ undrinkable by now.A) became B) had become C) has become D) become2. _ when she started complaining.A) Not until he arrived B) Hardly had he arrived C) No sooner had he arrived D) Scarcely did he arrive3. We have done things we ought not to have done and _ undone things we ought to have done.A) leavingB) will leaveC) have leftD) leave4. _ the flood, the ship would have reached its destin
