问题
For thirteen years after his return from Europe， __________ .
A:the Chicago Daily News was worked for by Carl Sandburg
B:Carl Sandburg"s work for the Chicago Daily News
C:when Carl Sandburg worked in Chicago for the Daily News
D:Carl Sandburg worked for the Chicago Daily News
B:Carl Sandburg"s work for the Chicago Daily News
C:when Carl Sandburg worked in Chicago for the Daily News
D:Carl Sandburg worked for the Chicago Daily News
正确答案是：
