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  3. Adults sometimes envy children who play all the time ______ they themselves have to work, rain or shine.

Adults sometimes envy children who play all the time ______ they themselves have to work, rain or shine.

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问题 Adults sometimes envy children who play all the time ______ they themselves have to work, rain or shine.
选项 A、while
B、once
C、since
D、though
答案A
解析 本题考查连词的用法。while当……同时，once一旦，since自从……，though虽然，即使。
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