they helpde us time and again,___very kind of them.a which was b which were请问 怎么判断使用was 还是用were?

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they helpde us time and again,___very kind of them.
a which was b which were
请问 怎么判断使用was 还是用were?

a which was
主要看意思.
they helped us time and again,
他们不时的总帮我们,他们的(这一点)是非常友好的.
which指代的是,“他们不时的总帮我们”前面整个句子,这种情况,通常是单数.

a which was-----本句指前面陈述的整个一件事。