问题: choose the best one and why
Premier Zhou worked many hours a day ___ he became seriously ill.
A. since B. even if C. that D.if
解答:
so that 引导结果状语从句：
She was so tired that she did nothing before going to bed.
语法上讲本句在many前加一个so就可以了，但意思还是不是很通顺．
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