$22 \cdot 1$ If skew lines $a, b$ are in planes $\alpha$ and $\beta$ respectively, and $\alpha \cap \beta=c$, then line $c$
(A) intersects both $a$ and $b$.
(B) does not intersect either $a$ or $b$.
(C) intersects at least one of $a$ or $b$.
(D) intersects at most one of $a$ or $b$.
(High School Mathematics Competition in Sichuan Province, China, 1989)
[Solution] As shown in Figure (1), options $(B),(D)$ can be ruled out; in Figure (2), option $(A)$ can be ruled out. Therefore, the answer is $(C)$.