.Emergency line operators must always __
题型:选择题
问题:
.Emergency line operators must always ______ calm and make sure that they get all the information they need to send help.
A.grow
B.appear
C.become
D.stay
.Emergency line operators must always ______ calm and make sure that they get all the information they need to send help.
A.grow
B.appear
C.become
D.stay