We can’t help you ____ you tell us what’s wrong.
A．SinceB．UnlessC．IfD．When
B
連詞辨析。     A. 由于；既然  B. 除非   C.如果  D. 考慮到；當(dāng)……時。句意：我們不能幫助你，除非你告訴我們怎么了。故選B
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