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。）