问题
While watching television, _______________________.
A:the doorbell rang
B:we heard the doorbell ring
C:there was someone knocking at the door
D:we heard the doorbell rung
B:we heard the doorbell ring
C:there was someone knocking at the door
D:we heard the doorbell rung
正确答案是：
同类题型
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______ I know, many thousands of tourists from the Mainland have been to Taiwan. [ ]
My younger brother couldn’t work out the answer and ______.[ ]
There are _______ visitors to the wetland park, and the number is becoming _______ now.
How many hours does the boss make the workers __ a day?–About ten hours.