He had no choice but to go on because it is their agreement that no one ______ quit the plan half way.
A．needB．willC．shallD．can
C

試題分析：句意：他沒(méi)有選擇只有繼續(xù)因?yàn)椴荒苡腥税胪径M(fèi)這是他們的協(xié)議。need需要；will表示意愿；shall允諾，命令。can有時(shí)，會(huì)。這里it是形式主語(yǔ)，that引導(dǎo)的是真正的主語(yǔ)。
點(diǎn)評(píng)：本題難度適中。情態(tài)動(dòng)詞是高中階段的重難點(diǎn)之一，需要考生熟記它們的用法，在各類(lèi)考試中經(jīng)常出現(xiàn)，它主要用于表示對(duì)過(guò)去情況進(jìn)行推測(cè)或責(zé)備等。
即學(xué)即練：---- What does the sign over there read?
---- “No person _______ smoke or carry a lighted cigarette, cigar or pipe in this area.”
A. will         B. may       C. shall        D. must
解析：C。shall 表示允許。
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