问题
选择题
.
The mail was ________ for two days because of the snow storm.
A．held out
B．held off
C．held up
D．held down
答案
答案：C
考查短语辨析。held out 伸出，held off 使保持距离，held up 使延误，held down 阻止，句意：邮件由于暴风雪延误了两天。所以选C。
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