-He looks really worried. He be having some problems. -I guess so. He’s weak in math and p

问题补充：

-He looks really worried. He be having some problems.

-I guess so. He’s weak in math and physics.

A. may

B. can

C. must

D. will

答案：

A. may

B. can

(答案→)C. must

D. will

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