John___ come to see us tonight, but he isn't very sure yet.

A. may B. can C. has to D. Must

A 【解析】句意：約翰今晚也許來(lái)看我們，但是他還沒有確定。A. may 也許，（不很肯定）； B. can表示推測(cè)時(shí)“可能”，往往用于否定句或疑問句；故排除B；C. has to不得不，用于客觀上的原因； D. must必須，表示推測(cè)“一定、準(zhǔn)是”，語(yǔ)氣較肯定，較有把握。根據(jù) isn't very sure yet還沒有確定。所以用推測(cè)可能性小的詞may，故選A。
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