问题
选择题
you had better drop your parents a ________ in case (以防)they are worrying about you.
A．message
B．news
C．letters
D．line
答案
答案：A
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you had better drop your parents a ________ in case (以防)they are worrying about you.
A．message
B．news
C．letters
D．line
答案：A