问题
选择题
23. Environmental experts are those who devote ______to______ nature and environment.
A．them…protecting
B．their…protect
C．themselves…to protect
D．themselves…protecting
答案
答案：D
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23. Environmental experts are those who devote ______to______ nature and environment.
A．them…protecting
B．their…protect
C．themselves…to protect
D．themselves…protecting
答案：D