______ you make a promise, you should keep it.
A．The momentB．While C．OnceD．As if
C

試題分析：原句意思是，一旦你做出了承諾，你就要遵守。The moment此刻While然而Once一旦As if好像，所以選C。
點(diǎn)評(píng)：解答此類題型首先要理解上下文題意，然后根據(jù)上下文之間的邏輯關(guān)系及英文習(xí)慣選擇正確答語。
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