Therefore,other things ____ equal,the number of workers that employers want decreases.A:is B:a为什么选C?A:isB:areC:beingD:having

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Therefore,other things ____ equal,the number of workers that employers want decreases.A:is B:a
为什么选C?
A:is
B:are
C:being
D:having

因为句子的谓语是decrease ,用动词ing 形式结构,前面半句则成为状语.

a