(2013·銀川高三二模)It remains to be seen ________ this plan is practical enough to keep the project going.
A．whether B．how
C．where D．when
A
選A　考查主語(yǔ)從句。句意：這個(gè)計(jì)劃是否足夠?qū)嵱�，以使這個(gè)項(xiàng)目繼續(xù)下去還有待觀察。it是形式主語(yǔ)，真正的主語(yǔ)是whether引導(dǎo)的從句。whether“是否”，符合句意。
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