一道关于英语时态的选择题，急求~
Hejoinedthearmyin1950and______thereasachemistfor5years.A.hasworkedB.workedC.hadworked...
He joined the army in 1950 and ______ there as a chemist for 5 years.
A. has worked
B. worked
C. had worked
D. would work
请说明理由，尤其是for的用法~越详细越好！ 展开
A. has worked
B. worked
C. had worked
D. would work
请说明理由，尤其是for的用法~越详细越好！ 展开
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