The number of medical schools reached 18 in the early 1990s and ______ around that level ever since．（　?。?/h1>

A．are remaining	B．have remained
C．is remaining	D．has remained

【答案】D

【解答】

【點評】

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A．will be increasing	B．has increased
C．were increasing	D．have increased

A．were made	B．have made
C．are made	D．have been made

1．This city （undergo） great changes since 1981.