单项选择题

Einstein’s theory of relativity seemed hard to believe at the time ______.

A. when he first introduced
B. that he first introduced it
C. he first introduced
D. which he first introduced it
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单项选择题
Sometimes it is necessary to be careful ______ the right date to sit for a test.
A. when choosing
B. when you will choose
C. when you have chosen
D. when you chose
单项选择题
Tina’s children, ______ all. live nearby, organized a big party for her eightieth birthday.
A. who
B. that
C. which
D. as
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