If you don’t try your best to learn all subjects you will behind.A. stayB. leaveC. fallD

问题补充：

If you don’t try your best to learn all subjects, you will behind.

A. stay

B. leave

C. fall

D. remain

答案：

A. stay

B. leave

(答案→)C. fall

D. remain

解析：考查动词词组：A. stay behind呆在后面 B. leave behind留下C. fall behind落后， D. remain behind仍然在后面，句意：如果你没有尽力学习所有的科目，你会落后的。选C。