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、maybe
B、can be
C、must be
D、is

答案C

解析 句意为:Bob没有参加夜校,他一定是生病了,因为他从来没有请假离开过。根据后半句可知,推测的是肯定的情况,故选C项,表示“确定,一定”。
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