He had a stomachache ________ he ate something bad this morning.
A．orB．ifC．soD．because
D

試題分析：句意：因?yàn)榻裉煸缟纤粤艘恍〾牧说臇|西，所以他胃疼了。A. or 或者，B. if如果；C. so所以；D. because因?yàn)椤８鶕?jù) ate something bad是 had a stomachache的原因，故用連詞because。故選D。
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