题目内容
Air pollution can affect humans by ________ sore eyes and respiratory problems, especially in children and ________.
[ ]
A.cause; the old
B.causing; the older
C.causing; the elderly
D.cause; the elderly
答案:C
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Mary is very thin now, but she ________ very fat.
[ ]
|
A .used to be |
B .use to be |
|
C .used be |
D .is used to be |