The first dictionary for students of English as a foreign language （）,into which the classification of sentence patterns was incorporated, was published in 1953.

A. Guide to Patterns and Usage in English

B. The Advanced Learner's Dictionary of Current English

C. A Handbook of English Grammar

D. Longman Dictionary of Contemporary English

虽然楔形掏槽有利于其它爆眼的爆破，但掏槽眼深受（）限制。