There are many things 'I've had____I was a little child.A.for B.since C.when请说明原因
问题描述：
There are many things 'I've had____I was a little child.A.for B.since C.when请说明原因
答
B.since
因为前面用的是are,不是were.证明我现在还拥有这些 many things.所以是since.
如果选for,是错误的语法.
如果选when,说明的是当我还是小孩的时候我拥有的事,前面应该用过去时were,而不是are.