标题: 求解 以语法题 [打印本页] 作者: 飘洋过海 时间: 2010-2-8 00:17 标题: 求解 以语法题 The demand for airplane mechanics is expected to grow about ten percent a year in the next decade, largely because new federal rules calling for major modifications to older planes and because the air-lines are adding hundreds of new jets.
(A) new federal rules calling for major modifications to older planes (B) new federal rules call for major modifications to older planes