The wet weather will continue tomorrow when a cold front to arrive.
A. is expected
B. is expecting
C. expects
D. will be expected
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(答案→)A. is expected
B. is expecting
C. expects
D. will be expected
解析：考查时态和语态。When引导的时间状语从句中，使用一般现在时代替将来时，本句的a cold front与expect构成被动形式，故A正确。