The year 1848 was the one ____________ witnessed the beginning of California Gold Rush: the gold was first discovered at Sutter's Mill, in Coloma, California.
A. when B. where C. that D. /正确答案C
The year 1848 was the one ____________ witnessed the beginning of California Gold Rush: the gold was first discovered at Sutter's Mill, in Coloma, California.
A. when B. where C. that D. /正确答案C
