你先把 more likely這個副詞片語 移到 to 的前面，變成 have been more likely to V
而 S + have/has been more likely to V 意思是:自...以來，S 都比較容易/傾向於...
ex1: Since 1972, young women have been more likely to vote than young men...
ex2: Historically, men have been more likely to cheat...
(此二例句出自網路文章)
而文章裡這句話的 have 之前還有 would，可以解釋成假設語氣法。
※ 引述《hilario (sdwdfqwe)》之銘言：
: 插入句題13: Indeed, the contribution of volcanoes and solar activity would
: more likely have been to actually reduce the rate of warming slightly.
: ^^^^^^^^^^^^^ ^^^^^^
: 請問這句為何要用have been to V呢?
: 為何不用 ....more likely to (actually) reduce the...現在式
: 或 more likely have reduced the..... 完成式
: 我在我的文法書上也找不到 have been to V的用法
: (只有曾經去過某地,這又好像不是)
: 謝謝..
: (解題好像沒什麼問題)
: Pa. 7 : Inaddition to the internal variability of the global climate system
: itself, there is the added factor of external influences, such as volcanoes a
: solar activity. █ There is growing body of opinion that both these phsical
: variations have a measurable impact on the climate. █ Thus we need to be abl to include these in our deliberations. █ Some current analyses conclude that
: volcanoes and solar activity explain quite a considerable amount of the
: observed variability in the period from the seventeenth to the early twentiet
: century's, but that they cannot be invoked to explain the rapid warming in
: recent decades. █
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