(一)
1.—He must be busy doing his homework right now.
—I imagine____.
A. that B. to C. so D. it
選C。I imagine so=I think so,
2. Mary had promised to give me a ticket for tomorrow. She failed, ____.
A. either B. though C. but D. too
選B。結(jié)合上下文意思我們可以知道本題表示轉(zhuǎn)折關(guān)系,先排除A、D;而but為并列連詞通常放在句首或句子中間起連接作用。故選B。