下列哪项无肺内多发空洞（）
A.肺结核
B.肺泡细胞癌
C.转移性肺癌
D.肺吸虫病
E.韦格肉芽肿
参考答案：B
He served in the army in _______ when he was in his twenties. [ ]
A. 1940's
B. 1940s
C. the 1940s
D. the 1940s'
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