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：a cold front是expect的逻辑宾语，故用被动语态，在主句为将来时态的句子中，时间状语从句时态用一般现在时态，故选A。