问题
选择题
—Has Jack finished his homework yet? I am waiting for him.
—I've no idea. But he _____ on it the whole afternoon.[ ]
A. is working
B. works
C. was working
D. worked
答案
答案：C
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—Has Jack finished his homework yet? I am waiting for him.
—I've no idea. But he _____ on it the whole afternoon.[ ]
A. is working
B. works
C. was working
D. worked
答案：C