虽然，每至于族，吾见其难为，怵然为戒。
参考答案：
虽然是这样，每当碰到筋骨交错聚结的地方，我看到那里很难下刀，就小心翼翼地提高警惕。
—________ two months enough for the project to be finished?
—I am afraid not. The professor is ill and only after he recovers ______ go on with it.
A．Is; he can
B．Are; he can
C．Are; can he
D．Is; can he
