[译] 既然他还没有完全康复，安排他做这么艰苦的工作是不合适的。
[误] Now that he hasn't fully recovered yet, it will not be proper to assign him such a hard job.

[正] Since he hasn't fully recovered yet, it will not be proper to assign him such a hard job.
[注] Now that 意思和 since (既然, 由于) 接近, 但 now that 必须引出一个新的情况, 否则需要由别的词替代。此句中用 now that 不妥, 该换用 since, 因为"他还没恢复健康"这一事实, 过去如此, 现在也如此, 不是现在才发生的新情况。