题目

阅读理解 When Ariyah Georges was born15 weeks early, she weighed only one pound, 12 ounces. Her mother, Jovan, knew howimportant breastfeeding was, especially for a premature (早产的) babylike Ariyah, so she began pumping milk to feed her through a tube. But two dayslater, Jovan felt dizzy and feverish — 104 Fahrenheit degrees, in fact. She hada blood disease and was close to full shock. She was separated from othersfor nearly two weeks at the regional Northern Virginia hospital where she'd delivered.During that time, she could still pump breast milk, but Ariyah couldn't consumeit bec —I wonder_______ you’ll water this kind of tree． —Once a week． A．how often          B．how long             C．how soon            D．how much