A:had played ; did
B:played; did
C:had played :was going to do
D:was playing; was going to do
A、B是一个连通器的两个上端开口,当用一个管子沿B开口吹气时,A开口一端的液面会____(选填“上升”、“下降”或“不变”).
根据语境,给下面一段话中划线的字注音。
做事战战惊惊,如履____薄冰的,一定不是李达康这样棱____角分明的人。