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1 If a friend () that his arms are weak,many of us know that

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1 If a friend () that his arms are weak,many of us know that it is his own fault.
1 worries 2 complains 3 blames 4 tells
我选的是4可答案是2请问为什么啊?
2 The subifets had to circle the word they()in the recording.
我填的是heard可答案是had heard这里为什么要干用过去完成时?是不是因为had to是过去时所以hear要用过去的过去所以用过去完成时?
1 If a friend () that his arms are weak,many of us know that
1 complains 抱怨.tells告诉.从这句话的语境上来看,抱怨不是更好吗?fault过错.
2 按这句话来说,自然是过去已经听到的,是过去的过去,就是说在圈这个动作发生之前听到的,而圈这个动作已经是过去的了.