My sister _____ as a secretary in her company for three years and now she _____ to

the manager of the sales department. [ ]

A. served; has been promoted

B. had served; has been promoted

C. has served; has promoted

D. was serving; has promoted

烧结空心砖和空心砌块（GB13545-2003）标准中规定，砖和砌块石灰爆裂中的一等品中允许出现最大破坏尺寸大于2mm且小于等于10mm的爆裂区域，每组砖样不得多于（）处。不允许出现最大破坏尺寸大于10mm的爆裂区域。

A、5

B、10

C、15

D、20