Mary wants to visit her uncle’s. She ______ for the bus for two hours but it has not come yet.

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问题 Mary wants to visit her uncle’s. She ______ for the bus for two hours but it has not come yet.

选项 A、has been waiting
B、is waiting
C、has waited
D、will be waiting

答案A

解析 表示从过去到现在一直在进行着的动作,要用现在完成进行时。答案为A。
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