If we work hard with a strong will, we _____ overcome any difficulty, however great it is．
A．mustB．needC．shouldD．can
D
考查情態(tài)動詞：A．must必須，B．need需要，C．should需要，D．can表示：有客觀可能，句意是：如果有堅強的意志去工作，無論困難有多大，我們都有可能克服它。選D。
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