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【简答题】
T4噬菌体rⅡ区域中发现一些突变。已知4个突变体中的两个经历了回复突变，而另外两个从未观察到回复突变。从下面表格中提供的重组数据，确定每一个突变体是点突变还是缺失突变(十代表重组，0代表没有重组)。
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A.
won't
B.
mustn't
C.
can't
D.
shouldn't
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