The doctor saw _________ that the child had measles, so he prescribed him some medicine at once.
A、at a time
B、at a glance
C、at a stroke
D、at a sitting
【正确答案】：B
【题目解析】：at a time一次，每次，在某时；at a glance一瞥，看一眼；at a stroke一下子；at a sitting一口气地
句意：医生一眼就看出那孩子患了麻疹，于是马上给他开了一些药。
