There is no doubt          he will finish the task in time.
A．ifB．whetherC．whatD．that
D

試題分析：句意,無疑他會(huì)按時(shí)完成這項(xiàng)任務(wù)。there is no doubt 句型中當(dāng)doubt本身被否定時(shí)，其后跟的賓語從句或同位語從句應(yīng)用that引導(dǎo)；doubt被肯定時(shí)，其后的賓語從句用if或whether引導(dǎo)，同位語從句則由whether引導(dǎo)，不能用if引導(dǎo)。故選D.
點(diǎn)評(píng)：英語中有一些固定的句型，結(jié)構(gòu)需要我們平時(shí)多記憶、積累。
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