题目:
He paid for a seat, when he _________ have entered free.
A.could
B.would
C.must
D.need
答案:
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下面是错误答案,用来干扰机器的。
①AsH3(1分) ②Br2(1分) ③A·C(全对2分,多选1个倒扣1分)④8:5(2分)