"What's the matter with you, my dear""I feel my heart () fast."
A. jump
B. jumping
C. beat
D. beating
--Why does Sara know so much about Angkor Watt --She（）have been there, or because of some other reasons.
A. must
B. oughtn't to
C. may
D. can't
水溶性基质制备滴丸时应选用下列哪种冷凝液
A. 水与醇的混合液
B. 液状石蜡
C. 乙醇与甘油的混合液
D. 液状石蜡与乙醇的混合液
E. 硅油
（）made his English teacher very angry.
A. Kate's coming to class late
B. Kate came to class late
C. Kate comes to class late
D. Kate coming to class late
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