if only the letter__there in time.a arrive b is arriving c had arrived d has arrived

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if only the letter__there in time.a arrive b is arriving c had arrived d has arrived

if only the letter__there in time.a arrive b is arriving c had arrived d has arrived
if only the letter__there in time.
a arrive b is arriving c had arrived d has arrived

if only the letter__there in time.a arrive b is arriving c had arrived d has arrived
选C, if only后面用过去式虚拟语气,即用过去的一系列时态表示与事实情况的相反.

if only"如果…就好了"表达一种愿望;通常用虚拟语气,所以本题选had arrived. 意思是如果信能及时到就好了,暗含这件事发生在过去而且信没能及时到。用arrives则是表示对将来的希望,但这里没有该选项,而题干又没有上下文提示。

if only 要是。。。就好了。 是一种虚拟语气,表达和现在的事实相反,所以用过去的时态来表达, 答案选 C