谁能帮我解释下这句英文里do的用法?Scientists are hard-line cynics; only after failing to debunk a controversial theory do they accept the evidence.

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谁能帮我解释下这句英文里do的用法?Scientists are hard-line cynics; only after failing to debunk a controversial theory do they accept the evidence.

谁能帮我解释下这句英文里do的用法?Scientists are hard-line cynics; only after failing to debunk a controversial theory do they accept the evidence.
谁能帮我解释下这句英文里do的用法?
Scientists are hard-line cynics; only after failing to debunk a controversial theory do they accept the evidence.

谁能帮我解释下这句英文里do的用法?Scientists are hard-line cynics; only after failing to debunk a controversial theory do they accept the evidence.
因为倒装
only……就是倒装的标志,倒装句用疑问句词序,do they accept the evidence.正是这种情况,do 是助动词

only 位于句首时有时起强调作用, 这时后面所跟句子要倒装,所以出现了 do ,正常语序是没有do的。

做助动词用,only放句首,用倒装,所以把do 提前了。