单项选择题

It was not until it got dark______working.

A. that they stopped
B. when they stopped
C. did they stop
D. that they didn't stop
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Helen was much kinder to her youngest child than she was to the others, ______, of course, made the others jealous.
A. who
B. what
C. that
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单项选择题
Rubber differs from plastics______it is produced naturally.
A. at that
B. in that
C. for that
D. with that
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