The child enjoyed _____ up the wooden bricks then knocking them down.
A. adding B. pushing C. piling D. forming
The child enjoyed _____ up the wooden bricks then knocking them down.
A. adding B. pushing C. piling D. forming
C
pile up (=lay in a pile or as if in a pile) 把. . . . . . 放成一堆, 堆积：pile up the books on the table (把书堆在桌子上) 。Pile up作不及物动词用, 意为“积压; (若干汽车) 相撞”：1) Perishable goods are piling up at the docks. (码头上易腐烂的货物堆积如山。) 2) Several cars piled up after ignoring the fog warning on the motorway. (由于无视高速公路上的大雾警告, 有好几辆汽车相撞。)