________ we will start the project has not been decided yet.
A．ThatB．Who
C．WhatD．When
D

試題分析：句意：我們何時(shí)開始這個(gè)計(jì)劃還沒有決定。這里是when引導(dǎo)的主語從句，它在從句中作狀語，that在主語從句中不作成分，主句中不缺少who的詞義，what在從句中作主語和賓語，這里不缺少，故選D。
點(diǎn)評：本題難度適中。連詞是近幾年高考的熱點(diǎn)，不僅在單選，完形和短文改錯(cuò)中都是常考的知識點(diǎn)，需要考生記住每一個(gè)連詞的用法，意義及區(qū)別。
即學(xué)即練：Give me one more minute________  I’ll have finished.
A. so       B. until     C. and      D. when
解析：C。句意：“祈使句+and+表示結(jié)果的句子”結(jié)構(gòu)。
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