—I’m sure Andrew will win the first prize in the final.—I think so. He _____ for it for months.

题干

—I’m sure Andrew will win the first prize in the final.
—I think so. He _____ for it for months.

A：is preparing

B：was preparing

C：had been preparing

D：has been preparing

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$\frac{1}{4} + \frac{3}{4} =$ ____	$\frac{1}{5} \times \frac{5}{6} =$ ____
$\frac{7}{10} - \frac{7}{10} =$ ____	$\frac{2}{3} \times \frac{3}{4} =$ ____