she didn't know which one to take How often are the Olympic

she didn't know which one to take How often are the Olympic At first,she didn't know which one to buy,but finally she th The old woman didn't know which bus she should take. Stuck in the landstorm,he didn't know which to take .前后两个句子之 I had to buy __of the books because I didn't know which one She didn't know how she could get to the railway station.（同义 She didn't know how to make a telephone call 英语同义句转换：When she asked me the question ,I didn't know how to she doesn't know ___ .A to take which step How often are the Olympic Games held? She didn't know how to do things by_______(she) when she sta 1.-How often does the Olympic Games take place?-_______.