问题
选择题
When you go outing with your sisters, you must see to ________ that they are safe.[ ]
A. everything
B. it
C. them
D. yourself
答案
答案：B
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When you go outing with your sisters, you must see to ________ that they are safe.[ ]
A. everything
B. it
C. them
D. yourself
答案：B