Question

Bob promises to join in the football match ______ he has to help his parents on the farm.

A．if

B．as

C．unless

D．when

Answer 1

C

考查從句的連接詞。句意“鮑勃答應參加足球比賽，除非他不得不要幫爸媽干農活。”A“如果”；B“當；正如”；C“除非”；D“當”。根據句意可知，用unless。故選C。