Acting like a blanket 是減化子句
some of the Sun's heat from reaching the Earth 是主要子句
題目問的是主要子句,只要照一般的句型規則判斷就可以了
(A)clouds stop ,用現在分詞會使的結構沒有動詞
(B)減化句是從屬子句的減化,而不是對等子句的減化,所以不能加對等連接詞and
(C)clouds are able to stop 缺少be動詞
17. Acting like a blanket, _____ some of..-阿摩線上測驗