[ Past Perfect Tense ]
It was a very difficult movie, but I _______ it because I _______ the book.
A. Had understood, read
B. Read, had understood
C. Had read, understood
D. Understood, had read

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Grammar › ViewA restrictive clause is necessary to the sentence and is not set off by commas.
A. TRUE
B. FALSE
Simple Tenses › View
Choose the correct verb to complete this sentence:
The bluebird in the tree _____beautifully.
A. singing
B. sing
C. sings