The wood of some trees is______.A.harder than othersB.harder than that of othersC.harder than that of others'D.harder than those of others

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Thewoodofsometreesis______.A.harderthanothersB.harderthanthatofothersC.harderthanthatofothers''D.hard

The wood of some trees is______.A.harder than othersB.harder than that of othersC.harder than that of others'D.harder than those of others
The wood of some trees is______.
A.harder than others
B.harder than that of others
C.harder than that of others'
D.harder than those of others

The wood of some trees is______.A.harder than othersB.harder than that of othersC.harder than that of others'D.harder than those of others
答案是B.