If a firm accepts Project A it will not be feasible to also accept Project B because both projects would require the simultaneous and exclusive use of the same piece of machinery. These projects are considered to be
【简答题】用所给动词的适当形式填空。 1. _____ you _____ (read) this story book before? 2. My mother _____ (go) out .She 's doing shopping in town. 3. The car doesn't move. What _____ I _____ (do)? 4. It was seven in the mor...