Scientists and doctors across the world have done _____ research over the years, hoping to find a cure for cancer.
| A．a great deal of | B．quantity of |
| C．quite a few | D．a large number of |
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Scientists and doctors across the world have done _____ research over the years, hoping to find a cure for cancer.
| A．a great deal of | B．quantity of |
| C．quite a few | D．a large number of |
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