【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,真正的主語是后面的主語從句。句意:這個計劃是否足夠可行以使這個項(xiàng)目繼續(xù)下去有待于時間來驗(yàn)證。根據(jù)句意及語法結(jié)構(gòu)可知,選A。

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