C because of -> becausehe A.didn't b.come yesterday ,C.because of he D. was ill.,那个错了？你确定没有错吗？你的选项很乱。正确的句子是下面的两个，你自己看吧：（ 注意：because +从句，because of +名词/代词）He didn't come to school yesterday ,because he was ill ./He didn't come to school yesterday ,becauseof his illness.