_________ there are certainly times when giving up trying is the right thing to do, in most cases all needed is commitment and communication.
A．UnlessB．BeforeC．AlthoughD．Since
C

試題分析：句意：雖然有一定的時(shí)候放棄嘗試是正確的事情,在大多數(shù)情況下都需要的是承諾和溝通。這兩句話是轉(zhuǎn)折關(guān)系，用although“雖然”，A. Unless除非，如果不，B. Before  在…前面， D. Since自從，所以選C。
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