题干
They were given food and shelter________ work
A：in need of
B：in place of
C：in exchange of
D：in charge of
答案(点此获取答案解析）
C
A：in need of
B：in place of
C：in exchange of
D：in charge of
⊥平面
内所有直线”的充要条件是“
”的必要不充分条件是“
是异面直线，
则