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When I am tired with math exercises, I            go out for a walk to get relaxed.
A．shouldB．mustC．needD．will
B
本題考查情態(tài)動詞。句意：做數(shù)學(xué)練習(xí)累了時(shí)，我經(jīng)常出去散步放松一下。此處will表示習(xí)慣。
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