【題目】It remains to be seen ______ this plan is practical enough to keep the project going.

A.whether B.how C.where D.when

【答案】A

【解析】此處it是形式主語(yǔ),真正的主語(yǔ)是后面的主語(yǔ)從句。句意:這個(gè)計(jì)劃是否足夠可行以使這個(gè)項(xiàng)目繼續(xù)下去有待于時(shí)間來(lái)驗(yàn)證。根據(jù)句意及語(yǔ)法結(jié)構(gòu)可知,選A。

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