Question

By the time he ____ at the party, all the other guests ____ playing games. A．arrived; had be..

By the time he ____ at the party, all the other guests ____ playing games. A．arrived; had begun B．arrived; began C．had arrived; began D．had arrived; have begun

Answer 1

A

考查by的时态。By的用法是，by后面跟什么时态，主句就采用什么完成时，总之by是完成时的标志。 所以选择A