题目

大雨过后，蚯蚓往往会爬上地面，是在进行（ ） A . 呼吸 B . 休息 C . 晒太阳 D . 觅食 答案：A37、The professor walked onto the platform and seated himself in a chair,       for answering questions.        A．had prepared        B．being prepared               C．preparing             D．prepared