Yourbikeneeds_____.You‘dbetterdoirightnow.
A、cleanB
need+to be done或 need+doing 都表示被动的动作。 类似的动词还有 want，require 等。他们都是后面跟动名词的主动式或不定式的被动式。
_____youunderstandthisrule，you‘llhavenodifficultyindealingwithsuchproblems.
Ifhe_____thestorekeeper‘sscissors，hewouldhaveforgottentobuyapair.
Itseemsasifthesun_____roundtheearthsinceitrisesintheeastandsetsinthewest.
Bothofmybrothersarenowmarried，soIhavetwo_____.
_____alltherepresentativesstillnotthere，themeetingwaspostponedforseveralhours.
