By the time the fire engines arrived,the house__to the ground.
By the time the fire engines arrived,the house__to the ground.
a was burned
b has been burned
c had been burned
d should have been burned
by the time是用于對(duì)將來的假設(shè)還是什么呢?
a was burned
b has been burned
c had been burned
d should have been burned
by the time是用于對(duì)將來的假設(shè)還是什么呢?
英語人氣：104 ℃時(shí)間：2020-01-28 15:01:17
優(yōu)質(zhì)解答
C by the time 是完成時(shí)的標(biāo)志,即：從句出現(xiàn)by the time,主句要用完成時(shí)態(tài).此題的從句是過去時(shí)態(tài),所以主句使用過去完成時(shí),若從句是現(xiàn)在時(shí)態(tài),則主句用現(xiàn)在完成時(shí).意思是：等到救火車到達(dá)的時(shí)候,房子早已燒盡了.
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