Some “healthy” habits, such as shower every day and sitting on the loo, be bad for you.
A. can
B. should
C. must
D. shall
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(答案→)A. can
B. should
C. must
D. shall
解析：考查情态动词。Can 可能，should应当，竟然 must必须 shall将会
句意为，一些健康的习惯，比如每天洗澡和坐在马桶上，可能会对你有害。Can表示理论上的可能性