单选题
Children of parents who did not go to university are probably more reluctant to ______ secondary education than those who did.
A、
put in
B、
fill in
C、
check in
D、
enroll in
【正确答案】
D
【答案解析】
put in：插话，插入；fill in：填(空或表格)；check in：办理入住手续；enroll in：报名参加。
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