单项选择题
A．He’s not sure about the time of the production. B．He’s not sure about the price of their products. C．He’s not sure about the quantity of their products. D．He’s not sure about the sequence of the production.
A、 She had lost the book. B、 She couldn’t bring the book back. C、 She had brought the wrong book. D、 She had forgotten the book.
A．She doesn’t understand the man’s words. B．She has never taken the bus before. C．She has never heard of the university. D．She is not familiar with the place.