several times, but he still doesn’t know to do it properly.

A．Being shown                                       B．Having shown

C．Having been shown                              D．I’ve shown him

________ several times, but he still doesn't know how to do it properly．

1. A.
   Being shown
2. B.
   Having shown
3. C.
   Having been shown
4. D.
   I've shown him

            several times, but he still doesn’t know how to do it properly.

A．Being shown                                              B．Having shown     

C．Having been shown                      D．I’ve shown him

________ several times, but he still doesn't know how to do it properly.

[　　]

________ for several times, but he still doesn't know how to do it properly.

[　　]

A．Having been shown

B．Being shown

C．Having shown

D．He's been shown