The doctor will not permit mother up __________ her leg is better.

A．if                B．until              C．when             D．unless

Every evening after dinner, _____ tired from work, I will spend some time reading.

A．unless            B．if                C．until             D．when

Every evening after dinner, _____ tired from work, I will spend some time reading.

A．unless            B．if                C．until             D．when

—Are you going to stay overnight?

—Not　　　　 it’s absolutely necessary.

A．when B．unless C．until　　　　　　　　　　 D．if

I did not know it ________ you told me.

[　　]