As is often the case, the fact that something is cheap doesn’t mean it’s of low quality.
A. necessarily
B. usually
C. certainly
D. mostly
网友回答
(答案→)A. necessarily
B. usually
C. certainly
D. mostly
解析：考查副词辨析。A必要，必然；B通常；C当然，一定；D大部分；not necessarily未必，一定；句意：正如情况所示，便宜的东西未必就质量不好。根据句意说明A正确。