英语四级
单选题
A．If
B．As
C．Though
D．Unless
参考答案：A进入在线模考
【解析】选[A]。结构衔接题。分析句子结构可知，这里应为一条件句，表示“如果你必须在一个梯子下面走，你可以采 取一定的措施避免霉运”，故[A]If为答案。[D]Unless“除非”为强干扰项，若填入空中，会使上下文逻辑混乱，故排除。
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