Even students of average intelligence ________ become top students by improving their study habits.
A．mustB．can
C．have toD．ought to
B
解析　考查情態(tài)動詞。句意為：即使智力一般的學生也可以通過改進學習習慣而成為優(yōu)等生。can在此處表示“能夠”。
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