Heconcludedhisspeechwitharemarkthatfailure____themotherofsuccess.
A、musthavelastedB
【句意】本期设计联络会将持续十天才会结束。
【难点】by the time意指no later than the moment that something happens，常与过去完成时和将来完成时连用。
Thefirststepinthestudyofanylanguageisobservingand____preciselywhathappenswhennativespeakersspeakit.
I’veneverbeenoutofChina___________.Whataboutyou?
Theforeigners_________there,butthey_________thefoodthereatfirst.
Ithink____importanttolearnEnglishwell.
-Wehaven’theardfromJaneforalongtime.
-Whatdoyousuppose_____toher?
