专四

单选题 Great efforts to increase wheat production must be made if bread shortages avoided．

A．will be
B．can be
C．are to be
D．were to be

参考答案：C进入在线模考
C。要避免面包短缺，必须更加努力地提高小麦的产量。考查将来时态。“be+不定式”表示将来，含有“按计划；必须”的意思，故选c。本句if表示的条件更接近真实的情况，因此不用虚拟语气，排除D。

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