From 'Not until 1998 did al Qaeda undertake a major terrorist operation of its own, in large part because Bin Ladin lost his base in Sudan.', can we infer that 'al Qaeda's first major terrorist attack was in 1993.' follows logically?
Not until 1998 did al Qaeda undertake a major terrorist operation of its own, in large part because Bin Ladin lost his base in Sudan.###al Qaeda's first major terrorist attack was in 1993.