Bob fails to attend the evening school. He______sick, because he never asks for leave.

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问题 Bob fails to attend the evening school. He______sick, because he never asks for leave.

选项 A、may be
B、can be
C、must be
D、is

答案C

解析句意为：Bob没有参加夜校，他定是病了，因为他从来没有请假离开过。根据后半句可知，表达的是肯定的情况，故选C项，表示“确定，定”。

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