if it （） caused by flaws,the scientists can observe it every

if it （） caused by flaws,the scientists can observe it everywhere.
如果
括号里应该填 is 还是 was

zzrfnjf 1年前已收到3个回答举报

badbady520 幼苗

共回答了18个问题采纳率：83.3% 举报

括号里应该填 is,句子的后面用的是一般现在时,时态要一致,所以前面也用现在时

1年前

陆无双无双幼苗

共回答了3个问题举报

共同探讨：前半部分属于假设，是不是该用was呢

1年前

jasmine0226 幼苗

共回答了2个问题举报

is it‘s固定搭配没有复数后面还有一个can那就必定是is了

1年前

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