Question

(2013·银川高三二模)It remains to be seen ________ this plan is practical enough to keep the project going.

A．whether	B．how
C．where	D．when

Answer 1

A

选A　考查主语从句。句意：这个计划是否足够实用，以使这个项目继续下去还有待观察。it是形式主语，真正的主语是whether引导的从句。whether“是否”，符合句意。