By the time my mother came back from work, my sister and I ________ supper and were waiting for her at the table.

By the time my mother came back from work, my sister and I ________ supper and were waiting for her at the table.

A．have cooked　     B．were cooking       C．had cooked        D．would cook

By the time my mother came back from work, my sister and I       supper and were waiting for her at the table.

  A．have cooked          B．were cooking        C．had cooked             D．would cook

 By the time my mother came back from work, my sister and I       supper and were waiting for her at the table.

By the time my mother came back from work, my sister and I ________ supper and were waiting for her at the table.

1. A.
   have cooked　
2. B.
   were cooking
3. C.
   had cooked
4. D.
   would cook

By the time my mother came back from work, my sister and I       supper and were waiting for her at the table.

A. have cooked     B. were cooking     C. had cooked       D. would cook

By the time my mother came back from work, my sister and I       supper and were waiting for her at the table.

       A．have cooked           B．were cooking   C．had cooked             D．would cook

By the time my mother came back from work, my sister and I       supper and were waiting for her at the table.

A．have cooked           B．were cooking         C．had cooked         D．would cook

By the time my mother came back from work, my sister and I       supper and were waiting for her at the table.

 By the time my mother came back from work, my sister and I       supper and were waiting for her at the table.

  A．have cooked       B．were cooking      C．had cooked          D．would cook