问题

The telephone _ three times in the last hour, and each time it __ for my father

A:had rang; was
B:has rung; was
C:rang; has been
D:has been ringing; is

正确答案是：

同类题型

This kind of fruit __________ a large amount of vitamin, ________ vitamin C.

____ the chat room ten minutes ago, you would have known what we were talking about! [ ]

If it is quite _______ to you, I will visit you next Tuesday.

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