燕麦细胞癌属于（）。
A.小细胞未分化癌
B.肺腺癌
C.Pancoast肿瘤
D.乳腺癌
E.鳞癌
参考答案：A
It was in 1969 ______ two Americans went to the moon by spaceship.
A．that
B．before
C．when
D．Since
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