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A．单句填空 1．—Where is Peter? I can't find him anywhere. —He went to the library after breakfast and________ (write) his essay there ever since. 答案 has been writing [句意：——彼特在哪？我哪也找不到他。——早饭后他去了图书馆，从那以后他一直在那写论文。根据句中的时间状语ever since可知，write 这一动作从过去某一时刻一直持续到现在，故用现在完成进行时has been writing。] 2．At college, Barack Obama didn't know that he________(become) the first black president of the United States of America. 答案 was to become [句意：在上大学时，巴拉克·奥巴马不知道他将成为美国第一位黑人总统。根据句意可知，“上大学”发生在过去，从过去的时间看将来，要用过去将来时，故用was to become。] 3．The reports went missing in 2017 and nobody ________(see) them since. 答案 has seen [句意：这些报告在2017年就丢失了，此后再也没人见到过它们。由题干中的since可知，本题应用现在完成时。] 4．—Hi, let's go skating. —Sorry, I'm busy right now. I ________(fill) in an application form for a new job. 答案 am filling [句意：——嗨！让我们去滑冰吧！——很抱歉，我现在很忙。我正在填申请新工作的表。此处表示正在进行的动作，故用现在进行时。] | 
