For advanced grammar, two options might seem correct, but one is more formal or contextually appropriate. The answer key confirms the "exclusive" choice preferred by examiners. Where to Find Support
Complete an entire unit before checking any answers. This builds the mental stamina required for long exams. For advanced grammar, two options might seem correct,
You don't have to wait for a classroom session to see if you've mastered a topic like Gerunds & Infinitives . For advanced grammar
Practice sets that mirror the difficulty level of high-stakes English proficiency exams. two options might seem correct