Question

What ______ you ______ when you father came back?

A．did, do

B．are, doing

C．were, doing

D．do, do

Answer 1

C

考查固定结构。Be doing…when…某人正在做某事。。。这时。。。；根据when you father came back指的是过去，所以用过去进行时，选C。