—What were you doing when Lucy ________in yesterday?

—I had just finished my homework and ________to take a shower.

A．dropping；start

B．had dropped；started

C．dropped；have started

D．dropped；was starting

--- What were you doing when Lucy ______ in yesterday?

---- I had just finished my homework and ____ to take a shower．

A．dropping; start                                      B．had dropped; started

C．dropped; have started                               D．dropped; was starting

一What were you doing when Lucy ______in yesterday?

一I had just finished my homework and ________to take a shower.

A.dropping；start　 B.had dropped；started

C.dropped；have started 　　　　　　 D.dropped；was starting