题文
Mr. Li made up his mind to devote all he could his oral English before going abroad.
| A．improve |
| B．to improve |
| C．improving |
| D．to improving |
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Mr. Li made up his mind to devote all he could his oral English before going abroad.
| A．improve |
| B．to improve |
| C．improving |
| D．to improving |
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