【C16】A．thatB．whatC．whyD．how

【B5】A．thatB．whatC．howD．when

（)they are doing has never been done before.A. ThatB. WhatC. WhyD. Whether

A．whenB．whatC．whyD．how

【C15】A．howB．whatC．whyD．which

【C2】A．thatB．whatC．callD．those

收集求助者资料时围绕的七个问题中最重要的是()A.whenB.whatC.whyD.who