【单选题】I will help other people provided they will know what is meant by "one good turn deserves another."
A、they could know
B、they had known
C、they have known
D、they know
网考网参考答案:D
网考网解析:
该句是个虚拟句。当主句用了will do,条件句中的动词应用一般现在时。
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