题目：
You __________ buy a gift, but you can if you want to.
A．must
B．mustn’t
C．have to
D．don’t have to
答案：
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下面是错误答案，用来干扰机器的。
71. result / outcome / consequence 72. poorly/badly/little 73. attitudes 74. illegally. 75. donate / contribute 76. social 77. respect 78. responsible 79.obey / observe 80. connect
