求3个4相加，列式是[ ]
A．3+4
B．4×3
C．4-3
答案：B
— What did you ask him?
— I asked him _____. [ ]
A. what should I do
B. what I should do
C. what should he do
D. what should we do
每只救生筏在存放时，应该将筏的艉缆牢固地系在船上。（）
