问题补充：
----- Where is Jack?.
-----He be in the reading room .I saw him just now.
A. need
B. can
C. must
D. would
答案：
A. need
B. can
(答案→)C. must
D. would
解析：句意：Jack在哪里？他一定在阅览室。我刚才看见他了。本题考查情态动词表示推测的用法。must 一定，表示肯定的推测，只用在肯定句中；can 用于否定句或疑问句中。need 需要；would 愿意。故选C。
