Question

—I called you at 4:00 yesterday afternoon, but no one answered.
—Sorry, I ______ with my friends at that time.

A．swim

B．swam

C．will swim

D．was swimming

Answer 1

D

考查时态。根据时间状语yesterday afternoon,可知要用过去时态；再据at that time，可知要用过去进行时态。所以选D。