问题
carry on the work ______ we can get the machineswe need. After all, it’s the determination that really counts.
A:unless
B:before
C:whether
D:while
B:before
C:whether
D:while
正确答案是：
同类题型
We should do things better with _______ people and ______ money.
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What’s your favorite subject-I like____best.
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__ as a volunteer teacher in Tibet for a year, Linda has become more experienced.