单选题
The letter they looked forward to______ at last.
A、
arrive
B、
arrived.
C、
arriving
D、
had arrived
【正确答案】
B
【答案解析】
[解析] 该题若仅根据look forward to而选择C,则整个句子缺少谓语。实际上,they looked forward to为定语,修饰The letter,主句缺少谓语动词,故选B。
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