A:whe
B:that
C:which
D:since
试验次数
金属质量(g)
金属氧化物质量(g)
1
45.0
84.9
2
85.1
3
85.0
平均值
m
— Who is Dave looking ______?
— His mother. She's been in hospital for a few days.
下列各句中,没有语病且句意明确的一句是( )