It remains to be seen ________ this plan is practical enough to keep the project going.
A．whetherB．how
C．whereD．when
A
A 考察名詞性從句。句意：這個計劃是否足夠可行讓這個工程繼續(xù)下去還有待于進(jìn)一步觀察。What引導(dǎo)主語從句，it是形式主語，根據(jù)句中的remains to be seen可知此處是指一種不確定性。故A正確。
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