Has Jack solved the difficult math problem？
Not yet． But I believe he_____in a few minutes．（ ）
A．has worked it outB．will work it out
C．was working it outD．works it out
Has Jack solved the difficult math problem？
Not yet． But I believe he_____in a few minutes．（ ）
A．has worked it outB．will work it out
C．was working it outD．works it out
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