That was the second time that I______ to China.A．wentB．had beenC．would goD．will go

It was the first time that such a had to be？

The second paragraph focuses on the fact that ______.A．fossil energy was once very cheapB．

On hearing of the case some time later， Conan Doyle was convinced that the man was not gu

It was no match that his car was seen near the bank at the time of the robbery.A.coincide

I was so______on my study that I didnt notice the time.A．preoccupiedB．intentC．engrossedD．a

This improvement meant that the exposure time was reduced to only a______of second in brig