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.stay
C.appear
D.become
Emergency line operators must always _____ calm and make sure that they get all the information they need to send help.
A.grow
B.stay
C.appear
D.become