The number of medical schools reached 18 in the early 1990s and ______ around that level ever since．（ ）
| A． |
are remaining |
B． |
have remained |
| C． |
is remaining |
D． |
has remained |
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The number of medical schools reached 18 in the early 1990s and ______ around that level ever since．（ ）
| A． |
are remaining |
B． |
have remained |
| C． |
is remaining |
D． |
has remained |
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