—You missed the train? —Yes. I had gone by taxi.A. If onlyB. Only ifC. So long asD. as lon

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(答案→)A. If only
B. Only if
C. So long as
D. as long as
解析：考查状语从句的引导词。If only 要是……就好了，Only if 只要，So/ as long as只要，句意：你错过了火车？是的，要是我乘出租车去就好了。所以选A。