问题补充：
He was allowed to go swimming he kept near the other boys.
A. on condition that
B. as far as
C. even if
D. as though
答案：
(答案→)A. on condition that
B. as far as
C. even if
D. as though
解析：
考点分析：连词辨析。 A在…条件下B 只要 C即使D好象。只有不远离群体的情况下，他才被 允许去游泳。根据句意A正确。
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