1 . In the past few years, My Heart Will Go On was a popular song among young people, ____ were often heard singing it at parties.

A．they

B．that

C．who

D．which

2 . The man answered the phone in a loud voice at the meeting, ________ made Andy annoyed.

A．that

B．what

C．who

D．which

3 . Carol said that the work would be well done by the end of October, ________ personally I wondered completely.

A．which

B．at which

C．in which

D．about which