{01}You"ll not succeed _____ you work hard.
A.when
B.if
C.unless
D.because
解析：
本题选C。
{02}John couldn"t finish his words _____ something had struck his throat. A.though
B.as though
C.when
D.since
解析：
本题选B。
A.when
B.if
C.unless
D.because
解析：
本题选C。
{02}John couldn"t finish his words _____ something had struck his throat. A.though
B.as though
C.when
D.since
解析：
本题选B。
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