—Could I surf the Internet for twenty more minutes, Mum?
—Oh, dear, if you________.
A．mustB．canC．mayD．should
A

試題分析：句意：--媽媽我可以多上20分鐘的網(wǎng)嗎？--哦，親愛的，如果你偏要的話。Must“必須，偏要”，符合句意，can“能夠，可以”，may“可能，可以”，should“應(yīng)該”，選A。
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