–– When did they arrive?
–– They ______two hours ago .They ______ here for two hours .

–– When did they arrive?

–– They ______two hours ago .They ______ here for two hours .

A．arrived; have arrived                    B．arrived; have been

C．got; have been                         D．reached; have reached

When did they ________ the new competition?

1. A.
   had
2. B.
   start
3. C.
   ask
4. D.
   do

–– When did they arrive?
–– They ______two hours ago .They ______ here for two hours .

1. A.
   arrived; have arrived
2. B.
   arrived; have been
3. C.
   got; have been
4. D.
   reached; have reached