Whether you believe it or not, it was________ caused the serious accident.

A．because of your carelessness that

B．because you were careless

C．you were careless that

D．your being carelessness that

（）是在提高婴儿社会交往能力时应注意的事项。

A、多给婴儿留一些时间，创造他们与同伴在一起的机会

B、让婴儿在安全的地方独自玩玩具

C、要多多和婴儿熟悉的小朋友一起玩

D、要多给他们留一些时间，创造与家长在一起的机会