Process has been very smooth. ______, we are not confident that it will be completed on time.
A．ThereforeB．BesidesC．ThoughD．However
D

試題分析：考察副詞辨析。A因此；B而且；C否則，要不然；D然而；句意：過程很順利，然而，我們很不自信會不會準(zhǔn)時完成。根據(jù)句意說明D正確。
點評：把相似、相近的詞語或結(jié)構(gòu)放在一起作為干擾選項，若我們基礎(chǔ)知識掌握不牢就難于區(qū)分。解答這類題目，關(guān)鍵是理解題干意思以及各選項副詞的意思，可以像數(shù)學(xué)中的代入法一樣，依次把各個選項意思放入句子中進(jìn)行比較，不難選出正確答案。
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