问题
选择题
—I am sure Mary will win the first prize in the final.
—I think so. She______ for it for months.
A．is preparing
B．was preparing
C．had been preparing
D．has been preparing
答案
D
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—I am sure Mary will win the first prize in the final.
—I think so. She______ for it for months.
A．is preparing
B．was preparing
C．had been preparing
D．has been preparing
D
面形态均应与对颌牙协调