2. 专升本
  3. It______for three days and nights now, so the postman is an hour late this morning.

It______for three days and nights now, so the postman is an hour late this morning.

admin2012-05-23  25
问题 It______for three days and nights now, so the postman is an hour late this morning.
选项 A、has been snowing
B、is snowing
C、had snowed
D、had been snowing
答案A
解析
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