1.(典型例题徽)Helen __ go on the trip with us, but she isn’t quite sure yet.
A. shall B. must C. may D. can
[考场错解] D
[专家把脉] 这里表示“能够”的can。根据后文“她还不是很肯定”，那么应当是不肯定的语气may了。
[对症下药] C
2.(典型例题国) I often see lights in that empty house. Do you think I __ report it to the police?.
A. should B. may C. will D. can
[考场错解] D
