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
B:appear
C:become
D:stay
正确答案是：
同类题型
the new schedule, school teachers must______each class on time, instead of adding extra lessons
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What was the party like ? -Wonderful It is years _____ I enjoyed myself so much
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