—How does Jack usually go to work?—He ______ drive a car, but now he ______ there to lose weight.

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—How does Jack usually go to work?

—He ______ drive a car, but now he ______ there to lose weight.

A：used to; is used to walk

B：was used to; is used to walking

C：was used to; is used to walk

D：used to; is used to walking

上一题下一题 0.0难度选择题更新时间:2018-06-30 08:08:38

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D

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① $\overset{⇀}{a}$ ∥ $\overset{⇀}{b}$ $\Leftrightarrow$ 存在唯一的实数 $λ \in R$ ，使得 $\overset{⇀}{b} = λ \overset{⇀}{a}$ ；② $\overset{⇀}{e}$ 为单位向量，且 $\overset{⇀}{a}$ ∥ $\overset{⇀}{e}$ ，则 $\overset{⇀}{a} = \pm | \overset{⇀}{a} | \overset{⇀}{e}$ ； ③ $| \overset{⇀}{a} \cdot \overset{⇀}{a} | = | \overset{⇀}{a} |^{2}$ ；④ $\overset{⇀}{a}$ 与 $\overset{⇀}{b}$ 共线， $\overset{⇀}{b}$ 与 $\overset{⇀}{c}$ 共线，则 $\overset{⇀}{a}$ 与 $\overset{⇀}{c}$ 共线； ⑤若 $\overset{⇀}{a} \cdot \overset{⇀}{b} = \overset{⇀}{b} \cdot \overset{⇀}{c} 且 \overset{⇀}{b} \neq \overset{⇀}{0}, 则 \overset{⇀}{a} = \overset{⇀}{c}$ 正确命题的序号是（）

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