几道英语选择麻烦详细解释下原因

题目

几道英语选择麻烦详细解释下原因
1. What upset the child was___to visit his mother in the hospital.
A his not to be allowed B him being not allowed C his not being allowed D him to be not allowed
2. I mistake your office____John's.
A with B for C on D to
3. Would you please call me up later___they decide to go camping?
A that B for C whether D when

答案

1.C
2.B
3.D
1.动名词作表语,his 是not being allowed 的逻辑主语,是动作执行者.
2.mistake ..for..把...误当做...
3.when...做时间状语,当...时候