We didn’t know you were in trouble at that time, _______ we would have given you a hand.
A．thereforeB．unlessC．otherwiseD．so
C

試題分析：句意，我們不知道你在那個時候有困難，不然我們就會幫助你。therefore 因此 unless 除非 otherwise 否則 so 因此，根據(jù)題目意思，故選 C，
點評：解答此類題型首先要確定上下文關(guān)系,根據(jù)前后文關(guān)系確定適當連詞，一定要把題干看完整，不可斷章取義。
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