_________ hard one may work, one cannot master a foreign language in a year or two.

A．Though B．As C．While D．However

D

解析試題分析：考查讓步狀語從句：句意：無論一個(gè)人學(xué)習(xí)的多么努力，一兩年都不可能掌握一門外語。However 引導(dǎo)讓步狀語從句的結(jié)構(gòu)是：However+adj/adv+主謂，A. Though雖然，可以引導(dǎo)讓步狀語從句，但是不能用倒裝，B. As引導(dǎo)讓步狀語從句的時(shí)候，應(yīng)該用倒裝，hard應(yīng)該提前，C. While雖然，可以引導(dǎo)讓步狀語從句，但是不能用倒裝，選D.
考點(diǎn)：考查讓步狀語從句

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