下列四幅地貌景观图中，因侵蚀作用而形成的地貌是
A
甲：NaHCO3、稀HCl；乙：NaOH溶液
B
甲：Al，稀H2SO4；乙：Ba（NO3）2溶液
C
甲：MgO，稀盐酸；乙：AgNO3溶液
D
甲：Cu、稀H2SO4；乙：BaCl2溶液
I didn't hear your call because I ______ to music at that time.
Not until we saw the manager did we know that the bank ________the company for the purpose of reducing its borrowings.
