Heconcludedhisspeechwitharemarkthatfailure____themotherofsuccess.
B
【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。
—Doyoumind__________here?
—________.
—Are you hungry now?
—_______. I have just had two bowls of rice.
______ they are twin sisters, they don ’t look like each other.