Directions: In this part there are ten incomplete sentences, each with four suggested answers. Choose the one that you think is the best answer. Mark your answer on the ANSWER SHEET by drawing with a pencil a short bar across the corresponding letter in the brackets. If I hadn’t stood under the ladder to catch you when you fell, you ______ now.
A．wouldn’t be smiling B．couldn’t have smiled C．won’t smile D．didn’t smile