单项选择题
（）is unknown to us all.
A. When did she arrive B. When she arrived C. That when she arrived D. In which she arrived
单项选择题 ______ I was there that evening.
单项选择题 I wonder if I （）time. If I （）time, I’ll go with you.
单项选择题 ______ they heard the shout for help, they rushed out.
