The number of books in the bookshop is about 10，000 and a number of them________about science．
| A．is |
| B．was |
| C．are |
| D．were |
The number of books in the bookshop is about 10，000 and a number of them________about science．
| A．is |
| B．was |
| C．are |
| D．were |
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